Answer:
g 1 phase
Explanation:
hipe this helps
The size of a cell increases in the G1 phase.
This is because a large amount of protein synthesis occurs and the volume of the cytoplasm increases.
describe the anatomy of the pharyngeal arches, pouches, and grooves. describe their position before and after embryonic folding.
The pharyngeal arches, sometimes called visceral arches, are identifiable antecedents that can be observed throughout the embryonic development of vertebrates.
Pharyngeal arches, pouches, grooves, and membranes make up the pharyngeal apparatus.
A pharyngeal pouch often referred to as a Zenker's diverticulum is a small hernia-like protrusion or pocket in the throat. Throughout evolution, pharyngeal pouches are changed into various organs. This demonstrates how various creatures use the pharyngeal pouch in different ways. Pharyngeal pouches are endodermal out-pockets that form between the pharyngeal arches during embryological development. The pouches develop into tissues that become the palatine tonsils, thymus, parathyroid glands, and thyroid parafollicular cells in addition to the middle ear cavity and Eustachian tube.
The head and neck structures are formed by a series of anterior tissue bands called pharyngeal arches, which are located under the developing brain. They are also known as visceral arches and are present in vertebrate embryos. They come from each of the three germ levels. These arches are first noticed in the fourth week of development in the human embryo. They emerge on both sides of the developing pharynx as mesoderm extensions. These arches support the gills of fish and are also known as branchial arches.
The lateral and ventral areas of the head and neck are formed in part by these embryonic tissues. In these areas, the majority of congenital malformations, which are frequently called branchial anomalies, develop as the pharyngeal apparatus develops into its adult counterparts.
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the following molecular equation represents the reaction that occurs when aqueous solutions of silver(i) nitrate and chromium(ii) chloride are combined. 2agno3 (aq) crcl2 (aq) 2agcl (s) cr(no3)2 (aq)
For this molecular equations, 2AgNO₃(aq) + CrCl₂(aq) --> 2AgCl(s) + Cr(NO3)₂(aq), the net ionic equation is: 2Ag+(aq) + Cl-(aq) --> 2AgCl(s).
How to write the net ionic equation for the given molecular equation?The given equation is:
2AgNO₃(aq) + CrCl₂(aq) --> 2AgCl(s) + Cr(NO₃)₂(aq)
The ionic equation shows only ions that participate in a chemical reaction. Thus, the AgCl is not counted because AgI is not soluble and does not form an ionic solution.
First, we need to rewrite this equation by separating the soluble ionic compounds as dissociated ions:
2Ag+(aq) + 2NO₃-(aq) + Cr₂+(aq) + Cl-(aq) --> 2AgCl(s) + Cr₂+(aq) + NO₃-(aq)
Next, we eliminate any spectator ions (NO₃- and Cr₂+).
Hence, the final net ionic equation is:
2Ag+(aq) + Cl-(aq) --> 2AgCl(s)
This question seems incomplete. The complete query is as follows:
“The following molecular equation represents the reaction that occurs when aqueous solutions of silver(I) nitrate and chromium(II) chloride are combined. Write the balanced net ionic equation for the reaction!”
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the quadriceps group includes all of the following except the biceps femoris. vastus lateralis. vastus medialis. vastus intermedius. rectus femoris.
The quadriceps group includes all of the following muscles except for Biceps fumoirs.
What are quadriceps?
Four distinct muscles (the "heads") make up the quadriceps femoris, the first of which lies superficially to the other three over the femur (from the trochanters to the condyles):
The centre of the thigh is occupied by the rectus femoris muscle, which mostly encloses the other three quadriceps muscles. It comes from the ilium. Its straight route gave rise to its name.On the lateral side of the femur is the vastus lateralis muscle (i.e. on the outer side of the thigh).On the medial side of the femur is the vastus medialis muscle (i.e. on the inner part thigh).On the top or front of the thigh, between the vastus lateralis and vastus medialis, is where the vastus intermedius muscle is located.The quads, also known as the quadriceps femoris, are one of the strongest and densest muscle groups in the body and help to shape the majority of the thigh.The thigh muscles can be further divided by experts into three compartments:
the front, medial, posterior anterior (back of the thigh)The quadriceps are a part of the anterior compartment, which extends the leg at the knee to allow for stability and movement, along with the sartorius and iliopsoas muscles.Hence, The quadriceps group includes all of the following muscles except for Biceps fumoirs.
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If you were traveling from Monterey on the California Coast to visit Yosemite National Park, on the eastern side of the state, what three major land forms would you pass through? (in order)
A) The Klamath Mountains, the Cascade Range and the Modoc Plateau.
B) The Transverse Ranges, the Mojave Desert and the Great Basin.
C) The Coast Ranges, the Central Valley and the Sierra Nevadas.
D) The Central Valley, the Sierra Nevadas and the Great Basin.
C.Every year, the Sierra Nevada & Coast Mountain Ranges change elevation and descent by a few millimeters. due to groundwater pumping during the summer and winter in the Central Valley of California.
Geophysicists have calculated that the annual increase in these mountain ranges is caused by the progressive depletion of a Central Valley aquifer brought on by groundwater pumping. Every year, the Sierra Nevada & Coast Mountain Ranges change elevation and descent by a few millimeters. Approximately the depth of a dime, with a 150-year growth of upwards to 15 cm in total (ca. 6 inch). due to groundwater pumping during the summer and winter in the Central Valley of California. As a result, the state's faults are stressed and the likelihood of an earthquake is increased by Coast Range, the Central Valley, as well as the Sierra Nevadas.
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the step where the most atp is made is question 4 options: glycolysis krebs cycle oxidative phosphorylation fermentation
oxidative phosphorylation is the answer that fits the bill. Hence the correct option is D; The most ATP molecules are produced during oxidative phosphorylation because oxygen is used as the final electron acceptor, which results in the reduction of ATP to water.
An electrochemical gradient of 34 ATP molecules is created when electrons flow through a chain of cytochromes.
Because the citric acid cycle involves the cyclic passage of electrons via other intermediates including succinate, fumarate, and other compounds before returning to acetyl CoA, option an is wrong.
Because glycolysis only releases two ATP molecules along with pyruvate, option b is wrong. Four molecules of ATP are produced in total, but two molecules are used up in the process, leaving a net yield of just two molecules.
Because the bigger polymer of glucose is broken down into smaller monosaccharide units that are required in biological operations to create energy, option c—digesting starch to glucose—is wrong because digestion of starch needs ATP.
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Full Question :
Which of the following stages in the breakdown of the piece of toast you had for breakfast generates the most ATP?
a. the citric acid cycle
b. glycolysis
c. the digestion of starch to glucose
d. oxidative phosphorylation
how do we recognize alleles that have recently been favored for selection, as opposed to those that have spread through the population farther in the past? explain your answer.
Natural selection will affect the heritable features of the population by favouring advantageous alleles and so increasing their frequency in the population, while favouring detrimental alleles and thereby decreasing their frequency. Adaptive evolution is the term for this.
A variant of the DNA sequence at a specific genomic site known as an allele may exist in two or more forms. For any chromosomal region where such variation exists, a person inherits two alleles, one from each parent. The person has homozygosity for that allele if the two alleles are identical. According to the definition of an allele given in the top textbooks on genetics and evolution, an allele is a different arrangement of the same nucleotides in the same location on a long DNA molecule.
Adaptive evolution is the process by which an organism undergoes evolutionary modifications to better fit its environment. Increased chances of surviving and procreating are the result of the alterations. The modifications make it possible for that specific creature to adapt to its surroundings. Positive selection allows beneficial mutations to spread, which is how adaptive evolution occurs.
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Which term describes the study of the distribution of genetic traits and the allelic changes that occur within a population?.
Population genetics is the branch of biology that investigates allele frequencies in populations and how they alter through time. Macroevolution, which involves significant changes over a long period of time, such as the emergence of new groups or species, is commonly contrasted with microevolution.
Which phrase best represents a shift in the populations' allelic frequencies?Microevolution is the gradual change in allele frequencies within a population. • Natural selection, genetic drift (chance occurrences that alter allele frequencies), and gene flow are the three mechanisms that might cause allele frequencies to shift (the transfer of alleles between populations).
What is the mechanism by which a population's trait distribution evolves over many generations?Populations of creatures go through a process called evolution.
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which of the following may explain irregular menstruation in physically active women?a. metaboreflex hypothesis *b. energy availability hypothesis c. lactate paradox d. hypothalamus hypothesis
(b) The energy availability hypothesis is the correct option that explains irregular periods in physically active women.
Irregular periods are often caused by a hormonal imbalance, especially estrogen and progesterone. our menstrual cycle can tell us a lot about our health. A regular period between puberty and menopause means your body is functioning normally. Menstrual problems, such as irregular periods or pain, can be a sign of a serious health problem. Menstrual problems can also lead to other health problems, including pregnancy problems. This cycle of changes occurs in women every month, positively for pregnancy it is called the menstrual cycle.
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what accounts for the different number of atp molecules that are formed through cellular respiration?
Because the composition of the electron transport chain varies between species, various organisms use their electron transport chains to produce varying amounts of ATP.
What explains the cellular respiration's variable ATP production?Different species have different limits on how many hydrogen ions the electron transport chain complexes can push across the membrane. In the electron transport chain, NAD+ produces more ATP than FAD+ and can affect the amount of ATP produced.
What causes cells to produce the most ATP?The majority of ATP synthesis takes place during cellular respiration inside the mitochondrial matrix, producing about 32 ATP molecules for every glucose molecule that is oxidized.
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11) describe the defining characteristics of a lipid and be able to recognize a structural diagram of a lipid as being a lipid.
A. Lipids cannot dissolve in water.
Polymerization of molecules like carbon, hydrogen, and oxygen results in macromolecules, often known as polymers.
The mammalian system uses four different types of macro molecules, which are
lipids
proteins, carbs, and DNA
Lipids are large molecules that are hydrophobic, meaning they do not dissolve in water. They support the body's production of hormones and cell membranes.
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In humans there are 23 pairs of chromosomes. One pair of the 23 are sex chromosomes. The other 22 pairs are known as?
Answer:D. 23 pairs of chromosomes are arranged from smallest to largest.
Explanation:
Wave absorption results in some of the waves energy being converted into thermal energy.
When a wave is absorbed, the matter absorbs energy from the wave, reducing the amplitude in the process.
As an illustration, when a sound wave strikes foam padding, the energy passes through the material and occasionally transforms into heat or other types of energy.
What happens to a sound wave's energy when it is absorbed by a substance?The molecules of a medium, like water, absorb sound as it flows through them and catch it.
The medium really converts part of the sound wave's acoustic energy into heat.
One way that this occurs is that the sound's acoustic energy induces the medium's molecules to begin vibrating.
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for which of the following processes are enzymes not required? multiple choice replication self-assembly translation maturation all of the answer choices are correct.
The process of assembling individual units of a material into highly arranged/ordered structures/patterns is known as self-assembly. Self-assembly processes are enzymes not required.
Self-assembly is the process by which a disordered system of pre-existing components forms an organized structure or pattern as a result of specific, local interactions among the components themselves, without the need for external direction. When the constituents are molecules, the process is known as molecular self-assembly.
What are the types of self-assembly?
Self-assembly is classified into two types: intramolecular self-assembly and intermolecular self-assembly. The term molecular self-assembly most commonly refers to intermolecular self-assembly, whereas folding refers to the intramolecular analog.
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What is a fixative? How and why must a fixative be used on fingerprints revealed by iodine furning?
Answer: When your finger is pressed down onto the paper, oils from the skin are transferred to the paper. These oils then react with the iodine vapor, producing a brown color that traces the fingerprint.
that is what fixative is
Explanation:
What is the independent variable in the above experiment
Answer:
The colour of light bulb
In the Northern Hemisphere, climate scientists observe seasonal changes in carbon dioxide concentration with the highest levels measured in May and the lowest levels measured in October. Hypothesize how photosynthesis can affect these changes. Explain your answer in three to five sentences.
A plausible hypothesis associated with seasonal changes in carbon dioxide concentration being the highest levels measured in May and the lowest levels measured in October is that the rate of photosynthesis will be higher in May because carbon dioxide is a reactant.
What is the rate of photosynthesis?The rate of photosynthesis refers to the amount of photosynthetic products that are generated in a given unit of time, which are generally measured as units of biomass both for plants and algae.
The rate of photosynthesis depends on the presence of reactants for this process which includes sun light and also carbon dioxide, which is a fundamental substance in order to produce carbohydrates during this process.
Therefore, with this data, we can see that carbon dioxide is a reactant of photosynthesis and therefore its concentration is fundamental to carry out this process.
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What is the total number of atp molecules produced through cellular respiration per molecule of glucose?.
Cellular respiration in a eukaryotic cell can convert one glucose molecule into 30 to 32 ATP.
How much ATP is created overall during cellular respiration per molecule of glucose?As a result, from a single molecule of glucose, up to 36 molecules of ATP can be created during the process of cellular respiration.
Why is the ATP 36 or 38?Because 2 ATPs are expended to power the movement of 2 NADH molecules into a mitochondria during cellular respiration, some textbooks claim that the net yield of eukaryotes is 36 ATPs (38 ATPs - 2 ATPs = 36 ATPs).
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Assume that a drop in parasite abundance reflects an effective immune response by the host.
What could explain the pattern revealed by your graph?
a) By the time the host developed an effective immune response to one surface glycoprotein, the parasite had changed to a different glycoprotein.
b) The host's immune response went through cycles of strength and weakness.
c) The host was infected by new Trypanosoma parasites three times during the course of the study.
d) The parasite went through regular, synchronized cycles of reproduction followed by death.
A parasitic is a living thing that inhabits or lives on the body of another species (its host) and derives its nourishment from the host.Whether the visit is parasite, mutualistic, or commensal, a host is a larger animal that accommodates a smaller organism.Usually, food and lodging are provided for guests.
How do parasites endure inside the human body?The term "parasite" refers to an organism that inhabits or lives on a living host of a species.They feed off of this host's nutrition to stay alive.We describe the various kinds of parasites or parasitic illnesses that can harm people in this article.
In which immune cells do parasites get treated?In addition to containing histamine, prostaglandins, leukotrienes, and proteases, basophils and mast cells also have IgE surface receptors. They play a role in the immediate form of hypersensitivity reactions as well as immunological responses to parasites.
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as with the cockroaches, human populations cannot continue to grow exponentially; at some point, we will reach the carrying capacity of the planet. thus, the growth curve of all populations (humans included) will eventually approximate a logistic curve. that is, the population will increase exponentially until it reaches a point at which individuals in the population are affected by environmental constraints on their growth. at that point, the rate of growth declines until the population reaches carrying capacity, and the growth rate of the population reaches zero.
1 The graph in Figure 32.5 shows a logistic growth curve. Population size- Time a. Which part of the curve depicts the initial phase of early, rapid, exponential growth? b. Which part of the curve depicts the decline in growth rate? top portion Blue portion Black portion bottom portion Complete the short answer question using complete sentences and so or fewer CHARACTERS (NOT WORDS). Note: Character counts include spaces 3 List some density-independent factors that could be responsible for the shape of this curve. Consider some abiotic factors that could potentially lead to decreased birth rates or increased death rates? Type answer here 4 List some density-dependent factors that could be driving the shape of the logistics growth curve. (Hint: Consider what biotic factors could be driving changes in birth rates or mortality?)
The correct option is B ; Top portion Blue portion Black portion bottom portion Bottom and top The black bars at the top and bottom of your screen,
also referred to as "letterboxing," are a result of the broadcaster's choice to present the material in a specific way. Usually, this is done to broaden the audience for the televised event.
Over the last 100 years, the human population has increased tremendously. It has mostly achieved this through generating copious amounts of food and figuring out how to manage sickness. When mankind first developed agriculture ten thousand years ago, there may have been only a million people on the earth.
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Based on the model, which three statements are correct about the role of energy in photosynthesis?.
Plants absorb light energy from the sun, plants absorb chemical energy from the sun, and energy from the sun is converted into chemical energy.
What is photosynthesis? Green plants and other organisms convert light energy into chemical energy through a process called photosynthesis. Light energy is collected and used during photosynthesis in green plants to convert water, carbon dioxide, and minerals into organic compounds rich in oxygen and energy. Where does photosynthesis take place? It takes place in the chloroplast, which houses chlorophyll. The thylakoid membrane is the third inner membrane that forms a long fold in the chloroplast and is surrounded by a double membrane, inside the chloroplast.
Question seems incomplete the complete question is ;
Based on the model, which of the three statements are correct all about the role of the energy in photosynthesis? A. The plant absorbs light was energy from the Sun. B. The plant is absorbs the chemical energy from the Sun. C. Energy from the Sun was converted into the chemical energy. D. The plant releases the heat energy from the Sun to its surroundings. E. The plant is uses energy from the Sun to be break the bonds of the glucose. F. Energy is from the Sun helps them form bonds between the water and carbon dioxide.
Hence option C is the correct option for the given question
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what is the most important preventative measure against vibrio vulnificus primary septicemia?
Most illnesses can be avoided by avoiding raw oysters because they frequently result in V. vulnificus-related septicemia. Consuming only raw oysters during the winter can also help to lower the risk of infection.
Gram-negative bacteria called vibrios can be found in estuarine and marine environments1. They can be found living freely in seawater as well as colonizing filter-feeding animals like shellfish. Although it can grow at temperatures as high as 105°F (41°C), its ideal growing range is between 68 and 95°F (20 and 35°C).
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Considering that sounds and odors both trigger changes in the patterns of action potentials in sensory neurons, how does the brain perceive which sense is which when the action potentials reach the brain?.
As sounds and odors trigger changes in the patterns of action potentials in sensory neurons, the brain perceive which sense is which as : axons from different sensory neurons go to different areas of the brain.
What is the function of sensory neurons?Sensory neurons are the nerve cells that get activated by sensory input from the environment. For example, when you touch hot surface with fingertips, then the sensory neurons will be the ones firing and sending signals to the rest of the nervous system about the information they have received.
Sensory nerves carry signals to the brain to help you touch, taste, smell and see whereas motor nerves carry signals to your muscles or glands to help you move and function.
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Write two paragraphs to explain how a specific human activity, such as the use of fossil fuels, is leading to climate change (first paragraph) as well as how a specific mitigation strategy, such as switching to biofuels could mitigate climate change (second paragraph).
A specific human activity, such as the use of fossil fuels, is leading to climate change because it leads to the increase of harmful greenhouse gas such as carbon dioxide, while we may mitigate climate change effects by reducing the emission of such gases and forestation.
What are greenhouse gases?Greenhouse gases are different types of gases present in the air such as carbon dioxide, water vapor and methane which trap the solar radiation before it may be spread to space, thereby increasing the temperature on the earth's surface.
We can change the effects of global warming and climate change by decreasing the industrial emission of carbon dioxide into the atmosphere, which may be achieved by decreasing the use of fossil fuels.
Therefore, with this data, we can see that the effect of global climate change may be mitigated by human activity aimed at achieving this goal.
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The three main factors that affect diffusion are concentration, , and .
Explanation:
concentration gradienttemperaturesize of moleculesstate of matterHope it helps. Please mark brainliest..
The three main factors that affect diffusion are concentration, molecule size, and temperature of the substances, and by the process of diffusion, the molecules flow from a higher to a lower concentration.
What is the importance of diffusion?The diffusion is the mechanism where the molecules move from the higher concentration to the lower concentration, and this mechanism is seen in many cellular processes such as the gases that exchange in the blood vessel near the lungs' alveoli and at the cellular level. Diffusion is important for various cellular activities, and as it is a passive transport, it does not require energy. Diffusion is seen in both plants and animals, and the importance of diffusion is that it depends upon the size of the molecules, and the smaller molecules diffuse faster than the larger.
As a result, the concentration, molecule size, and temperature of the substances are the three main factors that influence diffusion.
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1. describe the basic process of an elisa. what binds to what? when you get a positive or negative result from an elisa, what are you actually seeing?
An antibody or antigen (immunologic molecules) is involved, which may result in an antigen-antibody reaction to produce a positive result or, in the absence of a reaction, a negative outcome.
+ Antigen → primary antibody → secondary antibody → conjugated enzyme --> substrate
An antigen is a signal that lets your immune system know whether or not something is dangerous in your body. Antigens can be found on bacteria, cancers, viruses, and healthy bodily cells. Antigen testing is carried out to identify viral infections, keep track of and screen for certain diseases, and decide whether a donor is an appropriate match for a transplant. Typically, proteins or sugars (polysaccharides) present on the surface of organisms like cells or viruses are considered to be antigens. Every one of them has a distinct shape that your immune system recognises like a nametag to determine whether it belongs in your body.
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gene x can exist as a normal allele and also as a dominant mutant allele that causes a disease. you purify protein x from a homozygous normal individual and also from an individual that is homozygous for the mutant allele. you have an assay to determine the function of protein x. when you assay 1 mg of the purified protein from a normal homozygote, the activity is 100%. when you mix together 0.5 mg of the normal protein and 0.5 mg of the mutant protein, the activity is 13%. based on this experiment, why type of dominant mutant is this?
The dominant mutant is of dominant negative.
What is the dominant negative gene?
A mutation whose gene product adversely affects the normal, wild-type gene product within the same cell. This usually occurs if the product can still interact with the same elements as the wild-type product, but block some aspect of its function.
What is an example of a dominant negative mutation?
A well-known example of a gene that can incur dominant-negative mutations is the small GTPase Ras. These dominant-negative alleles of Ras are not functional themselves because they preferentially bind GDP and stay locked in the inactive state.
What does negative mutation mean?
A negative genetic test result means that no mutation was found in any of the genes that were included in the test panel.
Thus, the dominant mutant was of the negative type.
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Identify the physician who, in 1902, proposed a relationship between genes and the production of enzymes.
Sir Archibald Garrod, a British physician, was the first to postulate a link between genes and enzymes.
What connection exists between genes and enzymes?More specifically, the enzymes ultimately carry out the genetic code. ADVERTISEMENTS: Every step in metabolism is controlled by an enzyme, just as every biochemical pathway is. Enzymes are unique for each metabolic process, just as genes are for every single character.
Who made the decision that genes dictate which enzymes exist?As demonstrated by Beadle and Tatum, genes specify enzymes. It was discovered that several enzymes were absent in Neurospora mutants unable to produce arginine. The "one gene/one polypeptide" theory was advanced by Beadle and Tatum. According to the core dogma, information travels from DNA to RNA in cells.
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select all that apply choose all the ways neuromodulators alter synaptic transmission. multiple select question. adjusting the sensitivity of postsynaptic neurons to neurotransmitters promoting myelination by oligodendrocytes or schwann cells altering the breakdown and/or reuptake of neurotransmitter increasing the release of neurotransmitters by presynaptic neurons
The ways neuromodulators alter synaptic transmission based on the options and the correct options are (1),(3), and (4).
Adjusting the sensitivity of postsynaptic neurons to neurotransmitters.Altering the breakdown and/or reuptake of neurotransmitters.Increasing the release of neurotransmitters by presynaptic neurons.By changing the sensitivity of postsynaptic neurons to neurotransmitters, affecting the breakdown and absorption of neurotransmitters, and boosting the release of neurotransmitters by presynaptic neurons, neuromodulators can change synaptic transmission.
The strength and effectiveness of synaptic connections within the nervous system are controlled by a combination of these mechanisms.
Therefore, Adjusting the sensitivity of postsynaptic neurons to neurotransmitters. Altering the breakdown and/or reuptake of neurotransmitters. And Increasing the release of neurotransmitters by presynaptic neurons. The correct options are (1),(3), and (4).
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if the micturition reflex is primarily controlled by parasympathetic innervation, then how is it that you have voluntary control of when you choose to urinate?
The external urethral sphincter is controlled by skeletal muscles if the parasympathetic nervous system is largely responsible for controlling the micturition reflex.
Skeletal muscle: What is it?
One of the three essential muscle tissues in the human body is found in the bone. Thousands of muscle fibres covered in connective tissue sheaths make up each skeletal muscle. Fasciculi are the different collections of muscular fibres that make up skeletal muscles.
The somatic nervous system is in charge of the voluntary skeletal muscles. The other types of muscle include non-striated smooth muscle and striated cardiac muscle. Both of these muscle groups can be classified as being autonomic, or under the control of the autonomic nervous system micturition reflex.
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a student using a compound light microscope is observing cells undergoing mitotic cell division. if the cells are from a bean plant which process the students will observe , explain the process in detail?
A compound light microscope is observing cells undergoing mitotic cell division. If the cells are from a bean plant this process is called Pairing of homologous chromosomes.
Two chromosomes in a pair—usually one inherited from the mother and one from the father. For example, the two copies of chromosome 1 in a cell are called homologous chromosomes. Homologous chromosome pairs, or homologues, are sets of maternal and paternal chromosomes that pair within a cell during fertilization. Although this organism is diploid, it has only one pair of chromosomes. They are homologous chromosomes because they have the same genes. However, it is possible to have different alleles of each gene, as the internal pattern suggests. Have the same relative position, value, or structure:
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