Answer:
1.The period during which a heart chamber is contracting is called systole.
2. The period during which a heart chamber is relaxing is called diastole.
3. During ventricular contraction, the AV valves (tricuspid and mitral valves) are closed.
4. During ventricular relaxation, the AV valves are open.
5. The pulmonary and aortic valves open when the pressure in the ventricles exceeds the pressure in the pulmonary trunk and aorta.
6. The first sound of a cardiac cycle occurs when the atrioventricular valves are closing.
7. The second sound of a cardiac cycle occurs when the semilunar valves are closing.
Explanation:
We can divide the heart cycle into two parts the systole and the diastole. The systole happens when the heart walls contract, and the diastole when these relax.
The relaxation and contraction allow the flow of blood into the different heart chambers.
During diastole, blood flows to the right atrium from the vena cavae superior and inferior, and the coronary veins and to the left atrium from the pulmonary veins. The blood accumulated in the atriums causes the AV valves to open, and blood flows to the ventricles. In this part, the atrium pressure exceeds the ventricular pressure allowing the blood's flow. When the atriums contract, the remaining blood that was in them, goes to the ventricles. Throughout all this process, the pulmonary and aortic valve is closed due to a pressure difference.
During ventricular systole, there are two phases. First, the ventricles contracts themselves, and the ventricular pressure increases, being higher than the atrium pressure. As a consequence, the AV valves close. During this first phase of contraction, there is not enough pressure to open the pulmonary and aortic valves. In the second phase, the ventricles completely contract themselves, the ventricular blood pressure increases. It becomes higher than the pressure in the aortic and pulmonary valves. As a consequence, the blood pushes the valves open, and blood goes out of the heart. Then, the difference in pressure between the ventricles and the pulmonary trunk and aorta causes the valves in these areas to close.
The first sound that we listen to is the S1 and is during the ventricular contraction that closes the atrioventricular valves. The second sound is the S2, and it happens when the semilunar valves close, also knowns as aortic and pulmonary valves. S2 occurs during diastole once that the blood is out of the ventricle and the contraction has finished.
what does each of these scientists study
Explanation:
Which scientists?
Write your full question
Which is not a type of crystal system?
A. hexagonal
B. monoclinic
C. orthorhombic
D. triangular
Answer:
D. the answer is triangular
⚠️HELP⚠️
UV rays, chemicals, radiation, and tobacco products are all agents known to cause cancer because they can cause the DNA in cells to be incorrectly transcribed, therefore continuously making a
protein. What are these agents caffed?
Pollution
A
B
Mutagens
С
Polypeptides
D
Anticodons
What do we think is the most important factor for supporting life on Earth?
A) It has liquid water
B) It has a very thick atmosphere
C) It has wombats - the adorable Australian marsupial. VITAL to life on Earth.
Answer:
B
Explanation:
A light bulb converts electrical energy to
thermal energy and mechanical energy
nuclear and chemical energy
electromagnetic (light) energy and thermal energy
electrical and chemical energy
Answer: electromagnetic (light) energy and thermal energy
Explanation:
Adolescents should be careful about what they eat , beacuse
Explanation:
(i) proper diet develops their brains. (ii) proper diet is needed for the rapid growth taking place in their body. (iii) adolescents feel hungry all the time.
Which is evidence of climate-forced sea level rise?
A. decreased temperature of oceans
B. submerging of low islands and coastlines
C. temperature changes for surface currents
D. increased carbon dioxide in the atmosphere
In this exercise we have to use the knowledge of climate changes that demonstrate the increase in the sea level, in this way we have that:
The submerging of low islands and coastlines or letter B.
The rise in sea level caused by global warming could reach 2 meters in height by the end of the 21st century. This rise in the oceans would leave thousands of kilometers of coastline at the mercy of flooding, jeopardizing the safety of 745 million people worldwide.
What could happen with sea level rise?The recent rise in sea level is a result of global warming through two main processes: expansion of sea water due to warming of the oceans, triggering its thermal expansion, and the melting of ice masses.
See more about sea level at brainly.com/question/25795078
Mrs. Jackson tells the class of a new species of living thing that was recently discovered. Cell theory states that which of the following must be true
about this new living thing?
A. It must be made up of one or more cells.
B. Its cells must be able to make their own food.
C. All its cells must perform the same function.
D. Some of its cells must include a cell wall.
Answer:
A. it must be made up of one or more cells. I hope it helps :)
Answer: D. some of the cells must include a cell wall
Explanation:
how do you call the collection of organisms that belong to different populations but all live in the same area and interact with one another
Answer:
Ecosystem
Explanation:
Ecosystem is the amount of variation shown by organisms in an ecosystem.
plz help me with this
Explanation:
A would be the correct answer
Please help !!!!!!!!!!!
territerrialAnd 3eat foxe Red
The major goal of the Social Gospel movement in the late 19th and early 20th century was to: Promote the spread of Protestantism in United States territories Promote the spread of Protestantism in United States territories Draw the attention of Protestant churches to the plight of the urban poor Draw the attention of Protestant churches to the plight of the urban poor Encourage support for Charles Darwin's theory of biological evolution Encourage support for Charles Darwin's theory of biological evolution Spread Nativist sentiments
Answer:
Draw the attention of Protestant churches to the plight of the urban poor.
Explanation:
The main aim and goal of the Social Gospel movement was to bring attention of Protestant churches to the difficult and dangerous solution of the urban poor. The main purpose of this movement is to combat injustice, suffering and poverty in the society. This movement started to solve the social problems such as social injustice, poverty, crime, economic inequality, alcoholism, Racial tensions slums, clean environment and child labor etc. This movement begun in the 20th century and has a great effects on he progressive-minded reformers.
Sickle-shaped red blood cells result from a mutation in the gene that codes for hemoglobin. This mutation results in sickle-cell anemia. A partial sequence of bases from a normal hemoglobin gene and a sequence that results in sickle-cell anemia are shown below
Complete question: Sickle-shaped red blood cells result from a mutation in the gene that codes for hemoglobin. This mutation results in sickle-cell anemia. A partial sequence of bases from a normal hemoglobin gene and a sequence that results in sickle-cell anemia are shown below (the diagram is in the attached file)
What type of mutation is depicted in this sequence?
Answer:
The type of mutation is known as SUBSTITUTION.
Explanation:
Sickle cell anaemia is an inherited disease caused by abnormal shape of the red blood cell. This abnormal red blood cell contains less haemoglobin and cannot transport oxygen efficiently round the body. Sickle-shaped (abnormal) red blood cells result from a MUTATION in the gene that codes for hemoglobin.
Mutation is the random changes in DNA that alters genetic information and so introduce new characteristics. The different categories of mutations include:
--> Chromosomal mutation and
--> Point mutation.
SUBSTITUTION is a type of point mutation in which one base is incorrectly added during replication and replaces the pair in the corresponding position on the complementary strand. From the diagram, a partial sequence of bases from a normal hemoglobin gene and a sequence that results in sickle-cell anemia, shows a substitution of an A for the middle T. This leads to GUA in the messenger RNA, which specifies the amino acid valine. The substitution of valine for glutamic acid at this particular position alters the chemistry of the hemoglobin such that it sticks together if it is not binding oxygen, creating sickling of the red blood cells.
on average how many toes does a human have? I think I have too many (not in a test, just wondering)
Answer:
10
Explanation:
we have 10 fingers and 10 toes
Answer:
10
Explanation:
We typicaly have 5 on the right foot and 5 on the left foot so 10 in total.
Hope that helps :)
Which idea associated with relative dating helped inspire Charles Darwin's work on evolution?
Answer: The idea that the earth is extremely ancient.
Explanation:
Charles Darwin was a British naturalist who worked on the organic evolution of living organisms and in his books outlined how present-day organisms evolved from earlier, different species.
Evolution is an extremely slow process. It is difficult to obtain direct evidence of evolution in action. However, scientist including Charles Darwin, have from many fields gathered a great deal of indirect evidence that supports the theory of evolution. This evidence comes from many sources which include the FOSSIL RECORDS.
The history of life on earth is recorded in fossils (remains of organisms preserved mainly in earth's sedimentary rocks). Scientist can determine the age of rocks in which fossils occurs by using RELATIVE DATING. This method give a geological time scale, showing earth's age ( as measured by dating it's rocks), and tracing the history of life on it.
Therefore the idea that the earth is extremely ancient is associated with relative dating which has helped inspire Charles Darwin's work as an evidence on evolution.
PLEASE PUT THIS IN THE CORRECT ORDER! I AM FAILING THIS CLASS :< PLEASE HELP! I will give brainliest!!!!!
Answer:
1. a solution forms from a liquid and dissolved substances
2. a warm solution flows through a crack in the rocks there
3. elements and compounds leave as the solution cools
4. elements and compounds crystallize
i hope this helps! :D feel free to clarify anything if you need to.
i need this answer quick please thanks
Answer:
B!!!!!!!!!!!!!!!!!!!
during this complete cycle, each blank molecule will go through a series of reactions to produce ATP , NADH , FADH, and CO2
Explanation is in the file
tinyurl.com/wpazsebu
largest single organ; cleans out poisons in blood and takes vitamins out of the blood
Answer:
The heart
Explanation:
I belive the heart is the largest organ. dunnk about the poison and vitamin part
Answer:
liver is the largest single organ; cleans out poisons in blood and takes vitamins out of the blood
How was life today similar and different to the Silurian period? ( animals, plants , organisms)
Answer:
The creatures developed in silurian period have evolved to live in sea bottoms.
Explanation:
Silurian life that is marine benthic which are bottom lying organisms belongs to the community of ecological zones that express themselves. As the gradients of temperature, pressure, and salinity. Consists of a community that is adapted to live in a darker region, used to lie in quieter environments that are in deep offshore water. These are much like the reef communities today as they do not tolerate excessive sediments. Prefer wave water that is shallow than 30 meters. These platforms are very gentle and are found over a hundred km gradients. Most of the fish represent the Silurian age and are widely distributed in marine environments. Examples of jawless fish, terrestrial fungi etc.anyone know the answer??????????????????????????????????
Answer:
The first one is the answer
Explanation:
Kingdom: Animal
Genus: Leucocephalus
Species: Haliaeetus
Which of the following processes is key to producing gametes?
Answer:
meiosis
Explanation:
Gametes are formed through meiosis (reduction division), in which a germ cell undergoes two fissions, resulting in the production of four gametes. During fertilization, male and female gametes fuse, producing a diploid (i.e., containing paired chromosomes) zygote
plz brainlist me
what would you make if you added CO2, water and energy
Answer:
You can react it with water to produce energy-rich hydrogen gas, or with hydrogen to produce useful chemicals, such as hydrocarbons or alcohols. If there were a sustainable, cost-efficient route to transform CO2 to CO, it would benefit society greatly.
Explanation:
Is enzyme substrate complex concentration the product of enzyme concentration and substrate concentration?
Answer:
Yes
Explanation:
The enzyme substrate complex may be defined as the enzyme when interacting with the substrate at an active site and it produces a new product in the process. It is temporary molecule formed when the substrate comes in contact with the enzyme.
An enzyme is the molecule of a protein which acts like an organic catalyst and a substrate is a the molecule which interacts with the specific enzyme to form a product.
Therefore, the enzyme substrate complex concentration is the product of the substrate concentration as well as the enzyme concentration.
Which of the following statements is not true of energy production in cells?
In cells, energy is released in small, controlled amounts
In cells, energy is released in small, controlled amounts
ATP is the primary form of energy for the cell.
ATP is the primary form of energy for the cell.
Cells release large amounts of energy in the form of heat.
Answer:
The third statement is not true.
Explanation:
Cells release small amount of chemical energy from glucose.
The correct answer is: "Cells release large amounts of energy in the form of heat."
Cells release energy by the process of cellular respiration.
A cell is the smallest unit of a living organism which can have independent existence.
Cells obtain energy by the process of cellular respiration. During cellular respiration, during cellular respiration, the energy stored in glucose is transferred to ATP.
The process of cellular respiration releases energy in cells in small controlled amounts.
For the products of cellular respiration, see:
https://brainly.com/question/19187571
What phyla is this animal?
Platyhelminthes
Nematoda
Annelida
Cnidarian
Answer:
Annelida
Explanation:
Hope this helps
Which statement best describes the term limiting factors?
Answer: what are the options?
Explanation:
This is a source of energy that can be concentrated on a dish, trough, or tower to create electricity-This energy source takes eight minutes to reach the Earth-The energy source is converted directly into electricity using PV cells *
Answer:
Concentrating Solar Power and solar panels.
Explanation:
In concentrated Solar Power technologies, mirrors tare used o concentrate the sun's light energy on the water container in order to convert it into heat to create steam which can drive a turbine that generates electricity while on the other hand, electricity can also be produced by installing solar panels that converts light energy into electricity using photovoltaic cell so both methods are different but the product is the same.
Please help it’s a fill in the blank,
Answer:
1] Vascular tissue
2] Producer
3] Cuticle
4] Cellulose
5] Transport.
Answer:
1. Cellulose
2. Vascular Tissue
3. Cuticle
4. Transport
5. Producer
Explanation:
I don't really have a explanation for this, I just guessed on this one really. I searched some stuff up but idrk if any of what I said is 100% correct :) I tried my best lol. Sending best wishes to you and this thing about plants :)
which kingdom consists of organisms that can be classified as either plants-like,fungi-like,or animal-like ?
Answer:
Kingdom Protista
The organisms within the Kingdom Protista contain a nucleus, like all Eukaryotes, and are categorized as plant-like, animal-like or fungus-like.