By adopting artificial selection, dog breeders consciously insist that survival and reproduction are not determined by chance.
What is the guiding concept of animal natural selection?One method of evolution is natural selection. More environment-adapted organisms are more likely to survive and pass on the genes that contributed to their success. Over time, species change and diverge as a result of this process.
Why is reproductive success critical to the process of natural selection?Long life is not favored by natural selection unless it allows for or resulting in increased reproductive success. The same is true for intelligence, strength, and beauty, despite our best efforts to the contrary. By adopting artificial selection, dog breeders consciously insist that survival and reproduction are not determined by chance.
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how woudl blocking the structures of teh conducting zone of the respiratory tract impair ventilation
The Structures that are blocked in the respiratory zone, where gas exchange occurs, have an immediate impact.
What is respiratory?
breathing is the process of inhaling and exhaling air. Biology. the entire physical and chemical processes that deliver oxygen to tissues and cells and release carbon dioxide and water during oxidation.
What is conducting zone?
Since they function as airways into and out of the lungs, the conducting zone includes the nasal cavity, pharynx, trachea, bronchi, and the majority of bronchioles
By blocking the structures in the conducting zone, air delivery to and from the structures where gas exchange occurs would not be possible. Structures that are blocked in the respiratory zone, where gas exchange occurs, have an immediate impact.
Therefore, Structures that are blocked in the respiratory zone, where gas exchange occurs, have an immediate impact.
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traditional ecological knowledge and western science the case of the bowhead whale what is science? science is both a set of practices (way of knowing) and the historical accumulation of knowledge (body of knowledge). nearly g
Science is a method for comprehending the natural world and the corpus of information created by several scientists.
Traditional ecological knowledge provides information about climate change across generations as well as the geography of the area's actual residents. Traditional ecological knowledge emphasizes and places at the center of the information it carries information about the health and interactions of the environment.
Whales are near the top of the food chain and serve as important indicators of the marine environment's overall health. The bowhead whale is classified as "special concern" in Canada. They are currently recovering from years of commercial whaler overexploitation.
Science, also known as Western science, is a body of knowledge that is based on certain laws that have been established by applying the scientific method to phenomena in the world around us.
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How would you expect the rate of speciation of an allopatric case to compare to the rate of speciation of a sympatric case involving formation of allopolyploid offspring?.
The rate of speciation of an allopatric case would occur at a much slower rate than the sympatric case involving formation of allopolyploid offspring.
Groups from an ancestral population evolve into separate species due to a period of geographical separation in allopatric speciation. The evolution of a new species from a surviving ancestral species and both continue to inhabit the same geographic region in sympatric speciation. An individual having two or more complete sets of chromosomes derived from different species is said to be allopolyploid. The speed or pace of the emergence of new species is slow in allopatric speciation compared to sympatric speciation involving allopolyploid offspring.
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what is name of the motif/domain that function to promote the dna-binding activity of many transcriptional activator proteins?
A zinc finger DNA-binding motif is common to many transcription factors in the human genome.
The first zinc finger motifs were identified in the structure of Xenopus transcription factor IIIA in 1985. This motif consists of a relatively short α-helix and a two-stranded antiparallel β-sheet.
Proteins has unique features, They binds to DNA as homodimers or heterodimers and recognize DNA through one of a small number of structural motifs. Their are other common motifs in transcriptional activator proteins that include the helix-turn-helix, the homeodomain, the leucine zipper, the helix-loop-helix, and zinc fingers of many types.
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the forest-dwelling ogiek, who live outside the direct control of the government of kenya, formed a nongovernmental organization (ngo) to seek aid in protecting their rights to their land and way of life. they might be known as what kind of group?
The forest-dwelling ogiek, who live outside of the Kenyan government's direct supervision, defending their rights to their property and way of life. They could be classified as an ethnic group.
Native forest-dwelling people, commonly known as tribals, make up roughly half of those displaced by large projects despite making up only around 8% of India's population, according to the country's top tribal rights activist. According to Madhuri Krishnaswamy, also known as Madhuri Ben (sister), an ethnic group who has been fighting for the rights of tribal people in Barwani Peoples, the majority of tribal people are marginal farmers who cultivate land that is only fed by rainfall (lacks irrigation) and cannot sustain them for more than a few months out of the year.
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what cell type remains after an adaptive immune response and is responsible for maintaining the steady-state level of pathogen-specific antibody in the circulation?
The cell type that remains after an adaptive immune response and is responsible for maintaining the steady-state level of pathogen-specific antibody in circulation is long-lived plasma cells.
Adaptive immunity is a kind of immunity that is made against infectious diseases.
This type of immunity produces a strong response against pathogens and hence is pathogen-specific. The plasma cells that are longed lived produce antibodies as well as memory cells against the specific microbes.
These plasma cells are longed lived so that they can recognize the specific pathogen whenever it invades the body.
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neutrophils and macrophages) signaled where to leave the circulation and enter the infection site? g
They accomplish this through a process called diapedesis, in which the leukocyte travels in an ameboid fashion through closely spaced endothelial borders (paracellular transmigration), and occasionally even through the endothelial cell itself.
Neutrophils migrate quickly to infection sites in tissue, even though they are typically found in the bloodstream. It is possible for neutrophils to move directly through endothelial cells (the transcellular route) or between them during the trans-endothelial migration (TEM) process.
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87) the transduction pathway that activates systemic acquired resistance in plants is initially signaled by a) antisense rna. b) pfr phytochrome. c) salicylic acid. d) abscisic acid. e) red, but not far-red, light.
The correct option is C : Salicylic acid (SA) is a plant defense hormone that is essential for both local and systemic acquired resistance (SAR).
Systemic acquired resistance (SAR) is a type of induced resistance that occurs throughout a plant following exposure to elicitors from virulent, avirulent, or nonpathogenic microorganisms, as well as artificial chemical stimuli such as chitosan or salicylic acid (SA)
Plant immune systems rely on their capacity to identify adversary chemicals, transmit signals, and respond defensively via processes involving several genes and their products.
Pathogens aggressively try to dodge and disrupt response pathways, favoring a decentralized, multicomponent immune system.
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describe three cranial features that differentiate the robust australopithecines from gracile australopithecines.
Greater prognathism, less flaring cheekbones, and smaller cheek teeth are characteristics of gracile australopithecines. Strong australopithecines had brow ridges that protruded outward.
What distinguishes gracile australopithecines from robust ones?The three cranial characteristics shown in the image below distinguish the robust australopithecines from the gracile australopithecines. The main difference between gracile and robust species is that while robust species had large cheek teeth, strong jaws, and powerful jaw muscles, sometimes anchored to a bony crest running along the top of the skull, gracile species had smaller cheek teeth, pronounced prognathism, less flared cheeks, and no sagittal crest.
What sets robust australopithecines apart from other species of the genus?Although some researchers continue to classify the robust species as Australopithecus, they are frequently assigned to the genus Paranthropus. They typically have larger jaws.
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Which serum value is a reflection of the effectiveness of the kidney’s ability to properly maintain serum metabolic ph?.
The capability of the kidney to sustain a healthy serum metabolic ph Bicarbonate (HCO3-).
Which blood number reflects how well the kidneys are able to maintain the right level of serum metabolic pH?
For each (H+) molecule produced into the renal tubular fluid during acid excretion, bicarbonate (HCO3-) is returned to the blood concurrently at the glomerulus.
How do the kidneys function to keep the blood's pH at a normal level?- The kidneys retain bicarbonate ions (HCO3-), which serve as an essential buffer for hydrogen ions (H+) in the blood, and expel a varying amount of hydrogen ions (H+) into the urine. These two actions assist in controlling blood pH.
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imagine you are an ecologist studying population growth and decline in a species of rabbits. you decide to set up an experiment to observe how a rabbit population grows and changes when there are no predators. as preparation, you plant a secluded forest meadow with a species of flowers that the rabbits eat and then fence it off to protect the rabbits from predators. you release a small population of rabbits into the meadow and, over the next few years, record how their population changes over time. at first, the rabbits eat the flower and grasses in the meadow and reproduce. eventually, the population of flowers and grasses declines. then, the population of rabbits declines. after the number of rabbit decreases, grasses and flowers begin the grow again, and are eaten by the rabbits. neither the rabbit nor flower and grass populations return to their highest levels, but both continue to exist. what appears to be the limiting factor in the growth of this rabbit population?
The limiting factor in the growth of this rabbit population here is the food supply.
What are growth limiting factors in a population?
Lack of a certain resource is a common expression for limiting circumstances. For instance, food becomes a limiting constraint if there are not enough prey species in a forest to sustain a large number of predators.
Here we can see that the population of rabbits decrease when the food available in the environment as competition for food increases with increase in the population of the rabits,and decrease in population of seen of the rabbits.
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which of the following is known as the process of natural selection associated with a population well adapted to its environment? a. genetic polymorphism b. stabilizing selection c. balanced polymorphism d. frequency-dependent selection e. directional selection
e. directional selection the following is known as the process of natural selection associated with a population well adapted to its environment .
What did the process of natural selection become known as?Natural selection, commonly known as "survival of the fittest," is the more prolific reproduction of individuals with advantageous features who survive environmental change as a result of those traits. This results in evolutionary change, with the characteristic becoming prevalent within a population.
Natural selection requires four conditions to occur: reproduction, inheritance, change in fitness or organisms, and diversity in individual characteristics among population members.
Natural selection holds that qualities that may be handed down assist animals to adapt to their environment better than other creatures of the same species. .
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Eukaryotes that are not fungi, animals, or plants are classified in a catch-all category called.
Answer:
protist
Explanation:
A protist is a category of eukaryote that is not a plant, animal, or fungi.
Which of the following does not influence hemoglobin saturation?
a. temperature
b. DPG
c. nitric oxide
d. carbon dioxide
Answer:
b. DPG
Explanation:
I don't know just random answer
Nitric oxide does not influence hemoglobin saturation.
Hemoglobin saturation is not directly affected by nitric oxide (NO). The amount of oxygen bound to hemoglobin in red blood cells is known as hemoglobin saturation. The effects of temperature, DPG (2,3-diphosphoglycerate), and carbon dioxide on hemoglobin saturation are discussed. Nitric oxide's primary functions in the body are as a vasodilator and signaling molecule. While it helps control blood pressure and flow, it has little immediate effect on hemoglobin saturation.
Therefore, the correct option is C.
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The ability of the arteries to withstand a sudden large increase in pressure is accomplished by the?.
The flexibility of the smooth muscles allows the arteries to sustain a rapid, significant rise in pressure.
What makes an artery resilient to pressure?They have an outer layer of collagen and a thick wall to prevent the artery from rupturing under the intense pressure. In order to maintain pulse flow, the artery wall also has an inner layer of muscle and elastic fibers.
What property makes arteries resistant to high pressure?The aorta and pulmonary arteries, which are the closest to the heart, are elastic arteries because they have much more elastic tissue in the tunica media than muscular arteries do. The elastic arteries' ability to maintain a relatively constant pressure gradient despite the heart's continuous pumping is due to this property.
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A plant can have either broad leaves (b) or narrow leaves (b). A plant with genotype bb is crossed with a plant with genotype bb. Which punnett square correctly represents this cross?.
Option C is the Punnett square that accurately depicts the hybridization of a genotype BB and a genotype Bb plant.
The genotypes of a specific cross or breeding experiment are predicted using a square diagram known as the Punnett square. It has the name of Reginald C. Punnett, who developed the strategy in 1905. The likelihood that a child will have a specific genotype is calculated by biologists using the diagram. The Punnett square is a table that lists all conceivable ways that paternal and maternal alleles might be combined.- These tables can be used to investigate the genotypical outcome probability of kids carrying a single trait (allele) or when multiple traits from the parents are crossed.
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Air has a higher concentration of oxygen molecules than does the cytoplasm of your lung cells. Where in your lungs will there be a net increase of oxygen?.
There is an overall rise in oxygen "within the lung cells."
Which is achieved by the body's transportation of both oxygen and carbon dioxide?The lungs and respiratory system enable breathing.They expel carbon dioxide and inspire oxygen into our body, which is referred to as inhalation (called expiration, or exhalation). The process of breathing involves exchanging carbon dioxide and oxygen.
Who supplies the body with its oxygen?Circulation in the lungs: Large artery that leaves the heart, the pulmonary artery is.It divides into two major branches, and the blood passes through them as it moves from the heart to the lungs. The blood breathes out carbon dioxide while absorbing oxygen from the lungs.
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which evidence supports the hypothesis that four-limbed animals came from fish? select all that apply.
Fish are the closest relatives of tetrapods, according to DNA study. - Before tetrapods appeared about 365 million years ago, the fossil record reveals an increasing number of fish with tetrapod-like characteristics. - Vertebrates include both fish and four-legged creatures.
DNA is the information molecule. It contains the instructions required to make proteins, another type of large molecule. These instructions, which are spread out over 46 extended structures known as chromosomes, are present in each of your cells. Each of these chromosomes is made up of several smaller pieces of DNA, called genes.
Tetrapods are a group of animals that includes mammals, birds, reptiles, amphibians, and other creatures. Tetrapods include all living vertebrates on land today as well as several extinct terrestrial animals that currently have an aquatic lifestyle (such as whales, dolphins, seals, sea lions, sea turtles, and sea snakes)
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during a single crossover event, how many strands of dna must break? (recall that dna is double-stranded.)during a single crossover event, how many strands of dna must break? (recall that dna is double-stranded.)eight strandsone strandtwo strandsfour strands
during a single crossover event, four strands of DNA must break.
The genetic material in humans and virtually all other species is called DNA, or deoxyribonucleic acid. A person's body has almost identical DNA in every cell. The trading chart's crossover occurs at the intersection of a security's price and a technical indicator line, or when two indicators cross. A financial instrument's performance is estimated using crossover, which are also used to foretell future shifts in trend, such breakouts or reversals.
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all the influenza viruses shown in the phylogenetic tree are thought to have arisen in one group of host animals. which group of animals do you think is the original source of the virus, and why?
The group of host animals in which all influenza viruses arose are birds. All viruses isolated in different groups of animals (e.g. pigs, horses, etc) had all their origin in birds (as indicated by the blue lineages).
All influenza viruses originated in the group of host animals known as birds. All viruses discovered in various animal species (such as pigs, horses, etc.) originated in birds (as indicated by the blue lineages).
Flu virus proteins are probably present in the nucleus, host cell membrane, and cytoplasm during an influenza virus infection. The genome type of an animal virus mostly determines the type of life cycle it has. A prophage can be formed by a lambda phage; a retrovirus would be a similar animal virus type. Some hosts manufacture interferons to protect themselves from animal viruses.
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what amino acid sequence does the following dna nucleotide sequence specify? 3′−tacagaacggta−5′ express the sequence of amino acids using the three-letter abbreviations, separated by hyphens (e.g., met-ser-his-lys-gly).
The amino acid sequence for the following DNA sequence is Met-Ser-Cys-His.
The process of converting the genetic information contained in the DNA into messenger RNA is known as transcription (mRNA).
DNA's sense strand, which runs from 5' to 3' and conveys information, and an antisense strand, which runs from 3' to 5' and acts as a template.
E.g.: Antisense strand 3′−TACAGAACGGTA−5′
mRNA sequence 5’−ATGTCTTGCCAT−3’
The process of converting the information carried by an mRNA into an amino acid sequence is known as translation.
The term "codon" refers to the sequence of three nucleotides that make up the genetic code.
For instance, the start codon "ATG" codes for the amino acid methionine.
Here, mRNA sequence 5’−ATGTCTTGCCAT−3’
Amino acid sequence: Met-Ser-Cys-His
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tubular re-absorption occurs from the nephron tubules into the . a. peritubular capillaries b. nephron loop c. renal corpuscle d. renal pyramid
Tubular reabsorption occurs from the nephron tubules into the peritubular capillaries.
The procedure that removes solutes and water from the filtrate and reincorporates them into your circulation is known as tubular reabsorption. Reabsorption describes the fact that they have already been absorbed once, when they originally entered the bloodstream from the digestive tract after a meal. Along with reabsorbing the substances you require, your nephrons have the ability to release undesirable substances from your bloodstream into the filtrate. The glomerular filtrate is transformed into urine by a combination of several processes.There are two stages to resorption Prior to entering the tubule, water and other dissolved materials must first move passively or actively from the fluid inside the tubule through the tubule's wall.
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The simultaneous arrival of graded depolarization and a graded hyperpolarization of equal but opposite magnitude at a particular location on the dendritic membrane is likely to _____.
cancel each other out, making it appear as if there was no change in membrane potential
The simultaneous arrival of graded depolarization and a graded hyperpolarization of equal but opposite magnitude at a particular location on the dendritic membrane is likely to cancel the effects of each other, as if there was no change in membrane potential. The correct answer is C.
Graded depolarization caused by sodium or calcium ion penetration. Graded hyperpolarization caused by excretion of potassium ions or entry of chloride ions. Thus, when equal but opposite degrees of graded depolarization and hyperpolarization occur at a given dendrite of a neuron, the positive and negative charges neutralize each other and have little or no effect on the total membrane potential. .
Graded potential cause transient, subtle changes in membrane potentials associated with neuronal dendrites. The magnitude of the change induced depends on the magnitude and duration of the stimulus. These can be depolarized or hyperpolarized.
The magnitude of the change depends on the magnitude and duration of the stimulus.
They can be depolarized or hyperpolarized.
Gradual depolarization caused by sodium or calcium ion penetration. Gradual hyperpolarization caused by excretion of potassium ions or entry of chloride ions. Thus, when equal but opposite degrees of graded depolarization and hyperpolarization occur at a given dendrite of a neuron, the positive and negative charges neutralize each other and have little or no effect on the total membrane potential.
your question is incomplete, but the most probably your full question was
The simultaneous arrival of graded depolarization and a graded hyperpolarization of equal butopposite magnitude at a particular location on the dendritic membrane is likely to _____
a. Cause depolarization, because graded depolarizations are more important to neuron function
b. Cause hyperpolarization, because graded hyperpolarizations are more important to neuron function
c. Cancel each other out, making it appear as if there was no change in membrane potential
d. Cause the apoptosis of the neuron
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atapuerca, dated to approximately 300,000 years ago, has yielded a sample representing about twenty-eight premodern homo sapiens individuals.
The site which has yielded a sample is A)Atapuerca which is representing about twenty-eight premodern homo sapiens individuals. So, correct option is A.
The archeological site of Atapuerca is situated in the region of Burgos in the north of Spain and is eminent for its proof of early human occupation. It was assigned a World Legacy Site in 2000.
The archeological meaning of this piece of the region of Burgos turned out to be progressively evident in the twentieth 100 years as the consequence of the development of a meter-check rail line (presently neglected) through the Atapuerca Mountains. Profound cuttings were made through the karst topography uncovering rocks and silt of highlights known as Gran Dolina, Galería Elefante and Sima de los Huesos.
The resulting exhuming of 1964 under the bearing of Francisco Jordá Cerdá prevailed with the disclosure of anthropogenic relics and human fossils from a wide time range (early people, agrarian gatherings, Bronze Age tenants).
Hence, correct option is A.
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(Complete question) is:
Which of the following sites, dated to approximately 300,000 years ago, has yielded a sample representing about twenty-eight premodern homo sapiens individuals?
a. Atapuerca
b.Ehringsdorf
c. Steinheim
d. Swanscombe
e. Petralona
When a stem cell divides, it produces two daughter cells. One daughter cell will remain a stem cell, while the other daughter cell will differentiate into a specialized cell. Which factor will most directly determine what type of specialized cell will be produced?.
The factor that will most directly determine what type of specialized cell will be produced is the genes that are expressed.
Stem cells are the raw materials of the body, the cells that give rise to all other cells with specialized functions. Under the right conditions, stem cells divide to form more cells known as daughter cells in the body or in a laboratory.
Embryonic stem cells are pluripotent stem cells derived from the inner cell mass of a blastocyst, a pre-implantation embryo in its early stages. Human embryos reach the blastocyst stage 4-5 days after fertilization, consisting of 50-150 cells.
Adult body tissues and embryos are the two main sources of stem cells. Scientists are also experimenting with genetic "reprogramming" techniques to create stem cells from other cells.
Stem cell differentiation is the process by which a cell transforms from a proliferation to a more specialized cell type. This is accomplished through a series of changes in cell morphology, membrane potential, metabolic activity, and signal responsiveness.
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Suppose a female fruit fly carries a mutation in her nanos gene that prevents expression of the nanos protein in any eggs she produces. Which effect is likely to be observed?.
Her eggs create fruit fly embryos with two heads, one of which is on a gene that blocks the expression of the nanos protein in any subsequent eggs she produces.
Which circumstances would cause developing ducks to lose their webbing?Webbing is lost as a result of apoptosis. Duck embryos that have been experimentally implanted with mutant BMP4 have non-webbed feet. Both the growth of a single organism and the evolution of species distinctions are governed by the actions of genes under the direction of genetic switches.
Which role do gap genes play in Drosophila?In Drosophila melanogaster and other insects, the gap gene system regulates the initial steps of the segmentation pathway. This system plays a crucial part in embryo patterning due to its tractability and has been the area of interest for both experimentalists and computational modelers.
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An organism is born with a mutation that results in ATP synthase (See figure) being entirely hydrophilic. Which of the following is likely to result from this mutation?
- The mutation will result in a severe decrease in the production of ATP leading to death.
- The mutation will prevent glycolysis from occurring within the organism.
- All of the above
An organism is born with a mutation that results in ATP synthase being entirely hydrophilic, the mutation will result in a severe decrease in the production of ATP leading to death.
With some of its subunits being water soluble and others being essential membrane proteins, the ATP synthase is attached to the inner membrane of the mitochondrion.
F1 (factor 1) and Fo are the two distinct parts of the mitochondrial ATP synthase (a factor that confers sensitivity to oligomycin). A proton turbine (inside Fo) and a molecular machine (F1) that uses rotational energy to create ATP from ADP and phosphate make up the reversible molecular motor known as the ATP synthase. The flow of protons along a potential gradient across the mitochondrial membrane produced by the electron transport chain during respiration drives the proton turbine.
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the process by which medications travel through body tissues until they reach the bloodstream is called:
The process is called as absorption that generally causes the medications travel through body tissues until they reach the bloodstream.
The maximum not unusual place mechanism of absorption for tablets is passive diffusion. This procedure may be defined via the Fick regulation of diffusion, wherein the drug molecule actions in step with the awareness gradient from a better drug awareness to a decrease awareness till equilibrium is reached.
Absorption is the procedure via way of means of which a drug enters the bloodstream. There are many feasible routes of administration, however the maximum not unusualplace are intravenous and oral. If a drug is run intravenously, the absorption section is skipped because the drug at once enters circulation.
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Before the cell can divide again, it must grow and synthesize proteins during the.
G1 is accompanied via way of means of S segment (synthesis), at some stage in which DNA replication takes area. The final touch of DNA synthesis is accompanied via way of means of the G2 segment (hole 2), at some stage in which mobileular increase maintains and proteins are synthesized in training for mitosis.
To divide, a mobileular have to whole numerous essential obligations: it have to grow, reproduction its genetic material (DNA), and bodily break up into daughter cells. Cells carry out those obligations in an organized, predictable collection of steps that make up the mobileular cycle.
The 2nd increase segment begins off-evolved to put together the cells with newly replicated DNA for access into the mitosis segment via way of means of installing area the important organelles for mitosis. The mobileular cycle is a crucial a part of the ongoing patience of all eukaryotes and prokaryotes.
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which of the following would reduce the glomerular filtration rate a. vasodilation of the afferent arteirole b. vasocontriction of the afferent arteirole c. a drop in oncotic pressure d. an increase in osmotic pressure in the glomerular capsule e. vasocontriction of the efferent arteirole
vasocontriction of the afferent arteirole reduce the glomerular filtration rate .
The kidney's glomerulus filters blood at a specific rate. The glomerular filtration rate is the name given to this rate.If there is a slight variation in the daily blood pressure, the glomerular filtration rate often does not alter. This slight shift is precisely controlled by our body.However, if there is a significant fall in blood pressure as a result of blood loss. In such cases, the afferent arteriole's vasoconstriction (contraction) is stimulated by the neurological system, which reduces blood flow to the glomerulus.This will lower the rate of glomerular filtration, which will ultimately result in less urine being produced.
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