When ventricles ________, the AV valves are closed. Group of answer choices open contract relax dilate
Answers
When the ventricles contract, the AV valves are closed. The correct option is B) contract.
During the cardiac cycle, the ventricles of the heart go through a series of contractions and relaxations to pump blood. The atrioventricular (AV) valves, also known as the mitral and tricuspid valves, are responsible for regulating the flow of blood between the atria and ventricles.
When the ventricles contract, the pressure inside the ventricles increases. This increased pressure forces the AV valves to close. The closure of the AV valves prevents the backflow of blood from the ventricles into the atria. Instead, the blood is forced to move forward into the arteries.
The contraction of the ventricles is known as systole, and during this phase, the AV valves remain closed to ensure efficient blood flow in one direction. Once the ventricles have contracted and the AV valves are closed, the blood is pushed into the arteries, and the semilunar valves, located at the bases of the arteries, open to allow blood to be expelled from the heart.
In summary, when the ventricles contract, the increased pressure inside them causes the closure of the AV valves, preventing the backflow of blood into the atria and allowing efficient forward movement of blood during systole.
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Related Questions
Write an essay on the situation and potential of mushroom cultivation in Nepal
Answers
Answer:
Mushroom cultivation has the potential to become a lucrative and sustainable industry in Nepal, with recent initiatives by the government promoting the industry for its nutritional value and growing market demand.
Explanation:
Mushroom cultivation has the potential to become a lucrative and sustainable industry in Nepal. The country's diverse climate, fertile soil, and abundant water resources provide ideal conditions for growing a wide variety of edible mushrooms.
Despite the favorable conditions, mushroom cultivation in Nepal is still in its infancy. However, there has been a recent surge in interest in mushroom cultivation as a means of generating income and improving food security. The government of Nepal has also recognized the potential of mushroom cultivation and has launched several initiatives to promote the industry.
Mushrooms are rich in protein, vitamins, and minerals, making them a nutritious addition to the diet. They are also a valuable source of income for farmers, as they can be grown in small spaces and require minimal investment. Furthermore, the demand for mushrooms is on the rise both domestically and internationally, presenting an opportunity for Nepalese farmers to tap into a growing market.
In conclusion, mushroom cultivation has the potential to provide a sustainable source of income for Nepalese farmers while also contributing to improved food security and nutrition. With proper support and investment, the industry can thrive and make a significant contribution to Nepal's agricultural sector.
What is the complementary strand of DNA that is made during DNA replication if the template/parent strand of DNA reads ATG GGC CAT?
A. TAC CCG GTA
B. UAC CCG GUA
C. ATG GGC CAT
D. CGA AAT AGC
Answers
The complementary strand of DNA that is made during DNA replication if the template/parent strand of DNA reads ATG GGC CAT is TAC CCG GTA. Thus, the correct option for this question is A.
What is DNA replication?DNA replication may be defined as a type of biological process through which two identical replicas of DNA form from one original DNA molecule. This process makes a copy of the DNA in a cell is made before the cell divides.
When it comes to the complementary strand of DNA, either of the two chains makes up a double helix of DNA, with corresponding positions on the two chains being composed of a pair of complementary bases.
For example, if Adenine A is present in the parental DNA, then it should be complementarily bounded to the thymine and vice versa. Similarly, if Cytosine is present in the parental strand of DNA, then it should be complementarily bounded by guanine and vice versa.
Therefore, the correct option for this question is A.
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in some genetic conditions, a change in the dna is thought to cause the condition. how could this occur and why?
Answers
A change or mutation in the DNA sequence can cause genetic conditions. This occurs due to various reasons including spontaneous mutations, environmental factors, and inherited mutations.
The impact of a DNA mutation on a person's health depends on several factors, including the type and location of the mutation, as well as the genes involved. Some of the common mechanisms that cause DNA mutations include:
Spontaneous mutations: These occur randomly and can result from errors that occur during DNA replication. DNA polymerases, the enzymes responsible for copying DNA, can occasionally make mistakes, leading to errors in the genetic code.Environmental factors: Certain environmental agents, such as UV radiation, chemicals, and viruses, can cause DNA damage that leads to mutations.Inherited mutations: Some mutations are passed down from one generation to the next. These mutations can arise from errors during meiosis, the process of cell division that leads to the formation of gametes, or from mutations in the sperm or egg cells of the parentsLearn more about mutation here:
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explain why a transparent epidermis is an adaptation for photosynthesis
Answers
Answer: A leaf’s upper epidermis is generally transparent that allowing the light to enter the leaf.
scientifically engineered specific molecules to fight a cancer-causing antigen are called? interferons, antimetabolites, antitumor antibiotics, monoclonal antibodies
Answers
Scientifically engineered specific molecules to fight a cancer-causing antigen are called monoclonal antibodies. A monoclonal antibody is a laboratory-made protein that mimics the immune system's ability to combat cancer cells. The immune system naturally produces antibodies to fight infections, but monoclonal antibodies are made to target specific antigens .
As a result, monoclonal antibodies are a type of targeted therapy, which means they attack cancer cells without harming healthy cells. They can be used alone or in combination with other treatments such as chemotherapy or radiation therapy.
Monoclonal antibodies have been approved for the treatment of various cancers, including breast cancer, lymphoma, and leukemia. They are also being studied for use in other cancers, as well as for non-cancer conditions such as autoimmune diseases.
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1. Discuss the importance of each of the following edaphic (soil) factors to living organisms. Water, Air, Mineral nutrients
Answers
The edaphic factor includes a range of proprieties of the soil, physical, chemical, and biological that are result from biological and geological phenomena. In the case of living organisms, we have those chemical and physical properties, such as minerals and water, as well as soil aeration influence ecology and evolution of plants and in consequence, associated biota, this is because plants are the base of the food chain as well as pioneers in many cases of ecosystem structure.
Following this line of thought, we have that soil is very important, factors as simple as the consistency, very different sand from mud, impact texture and chemical composition, and in consequence the type of organisms that can settle there, we can see that in deserts (sandy soil, limited water, good nutrients), the type of plants that grow have certain characteristics, for example, they live with very few water, and in turn, they provide refuge and food for other animals in the desert, on the other hand, we have places like confers forests, where the soil is rich and water is available in the subsoil, also tend to be mountainous sites, those plants are adapted to other conditions, their roots retain soil preventing erosion, also the kind of animals that depend on them are different.
When storm clouds produce lightning and thunder,
electric potential
energy changes to
energy and
energy.
Answers
Check all possible effects of this selective pressure.
Flock X may try to eat other foods.
Flock X could migrate in search of fruit.
Flock X could slowly decrease in number.
Flocks Y and Z could benefit and increase.
Flock X could try to mutate.
Answers
Answer:
Check all possible effects of this selective pressure.
✓ Flock X may try to eat other foods.
✓ Flock X could migrate in search of fruit.
✓ Flock X could slowly decrease in number.
✓ Flocks Y and Z could benefit and increase.
✕ Flock X could try to mutate.
Explanation: Got 100% on warm-up on edge. good luck :)
Answer:
A, B, C, D
Explanation: Big Brain
In addition to serving as building blocks of DNA, what other function do nucleotides perform in a cell?a. regulate cellular activityb. activate vesicular transportc. trigger muscle contractionsd. regulate gene expressione. chaperone protein folding
Answers
The other role of nucleotides in a cell is to control cellular activity.
What other functions do nucleotides perform in a cell?Building blocks of nucleic acids, energy storage, carriers of activated metabolites for biosynthesis, structural moieties of coenzymes, and metabolic regulators are all roles that nucleotides play in the physiology of animals. An chemical molecule known as a nucleotide serves as the foundation for DNA and RNA. They also play roles in metabolic processes, enzyme reactions, and cell signaling.
What role do nucleotides play in DNA?In rapidly dividing stages, nucleotides are particularly important for DNA replication and RNA transcription. Additionally necessary for supplying the cellular energy sources (ATP and GTP), nucleotides are also in a variety of other metabolic functions.
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6. The diagram represents a necessary part of human reproduction. This diagram represents the process of A. ovulation B. gastrulation C. mitotic cell division D. gametogenesis
Answers
Answer:
B. gametogenesis.
Explanation:
The development and maturation of sex cell through meiosis.
What is true of table salt?
D.It has simple molecules.
C.It has only one element.
B.It is an ionic compound.
A.It has radicals.
Answers
Answer:
c because it is
Through photosynthesis, plants convert energy from sunlight into what type of energy?
Answers
Answer:
Plants convert sunlight/solar energy to chemical energy
Answer:
Chemical Energy
Explanation:
Through photosynthesis the pigments in the chlorophyll capture light energy and convert it into chemical energy.
nitrogen fixation is an energetically costly process. what is the fuel that enables bacteria to split apart nitrogen molecules into a usable form for the plant?
Answers
Nitrogen fixation is an energetically costly process. The fuel that enables bacteria to split apart nitrogen molecules into a usable form for the plant is: ATP (Adenosine triphosphate).
Explanation: ATP is used by nitrogen-fixing bacteria to drive the conversion of nitrogen gas into ammonia. Nitrogenase enzymes, which are responsible for nitrogen fixation, require a great deal of energy to function. The energy is derived from ATP (adenosine triphosphate), a molecule that stores energy in cells.
Nitrogenase is a complex enzyme that contains a cofactor made up of iron and sulfur. When nitrogenase is exposed to oxygen, it loses its ability to function. Bacteria that fix nitrogen have evolved ways to protect the enzyme from oxygen, such as forming specialized structures called heterocysts.
The ability to fix nitrogen is a valuable adaptation that allows bacteria to survive in nitrogen-poor environments.
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Crop rotation is a planned order of specific crops planted on the same field. Crop rotation means that succeeding crops are of adifferent genus and species. Examples are row crops planted after small grains or grain crops after legumes. The planned rotationmay be for a two- or three-year period.What is a LIKELY ecological impact of crop rotation?A) The main crop becomes resistant to pests.B) It can interrupt the life cycles of certain pests.C) Lesser amounts of nitrogen are needed in the soilD) It ensures the presence of a single type of nutrient in the soilPlease select the correct answer choice.
Answers
A likely ecological impact of crop rotation is that it ensures the presence of a single type of nutrient in the soil. (option D)
Study the map. Which plate forms a boundary with the African Plate?
Answers
Answer:
down below
Explanation:
The western edge of the African Plate is a divergent boundary with the North American Plate to the north and the South American Plate to the south which forms the central and southern part of the Mid-Atlantic Ridge.
Answer:
south american
Explanation:
Nitrogen is included in the
makeup of proteins and
nucleic acids. Also, it is often
the limiting nutrient for what
type of organism?
Answers
which of the following statement or statements regarding simple diffusion is/are true? group of answer choices simple diffusion is limited by distance. simple diffusion requires a carrier protein. in simple diffusion, particles move from a high concentration to an area of low concentration. both b and c are true both a and c are true.
Answers
Simple diffusion is the movement of molecules from an area of high concentration to an area of low concentration until the equilibrium is achieved. It is the movement of molecules down a concentration gradient without the requirement of energy or carrier proteins. It occurs across the cell membrane until the concentrations on both sides become equal.
Regarding simple diffusion, it can be said that both a and c are true. Simple diffusion is limited by distance, which means that the rate of diffusion slows down with increasing distance between the point of origin and the point of diffusion. The greater the distance, the longer the time taken to reach the point of diffusion. Hence, this statement is true.
In simple diffusion, particles move from an area of high concentration to an area of low concentration. This is because the molecules are constantly moving and colliding with one another, which results in the distribution of the molecules. Therefore, the concentration of molecules becomes uniform across space, and the particles keep moving until they reach equilibrium.
On the other hand, the statement that simple diffusion requires a carrier protein is false. Simple diffusion does not require a carrier protein as it moves across the phospholipid bilayer of the membrane by simple means. Hence, option (E) is not true.
Therefore, both (A) and (C) are true regarding simple diffusion.
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A body cell prepares for cell division. How many chromosomes does it have at the beginning of prophase
Answers
Answer:
46 chromosomes, 92 chromatids
Explanation:
Answer:
84
Explanation:
Hope this helps!!
In a newspaper editorial, a writer states that research on human embryonic stem cells is valuable and worthwhile. Which describes the most common argument against the writer's statement?A.In a scientific argument, some physicians argue that stem cells are not likely to be part of any beneficial application or medical treatment.B.In an economic argument, some experts argue that the benefits of stem cells are not worth the high cost of developing and implementing the research.C.In a scientific argument, some researchers argue that the goals of stem cell research would be easier to achieve by other means.D.In an ethical argument, some people argue that human embryonic cells should be protected.E.In a philosophical argument, some people argue that stem cell therapy would change the personality or identity of the person receiving it.
Answers
In my experience the answer would be:
"In an ethical argument, some people argue that human embryonic cells should be protected."
Because as with abortion, the general idea is that stem cells or embryos have life and must be protected. Therefore, there are many people against stem cell therapies. However, in the scientific community, stem cells are not considered conscious organisms.
The axon sends the messages
from the cell body to the
a
A. motor cortex
B. synaptic knob
C. limbic system
Answers
which government agency is responsible for determining the clia complexity of all laboratory tests?
Answers
The FDA government agency is responsible for determining the clia complexity of all laboratory tests.
What is the FDA?
By guaranteeing the security, safety, and efficacy of biological products, medical devices, our nation's food supply, cosmetics, and radiation-emitting equipment, the Food and Drug Administration (FDA) is responsible for protecting the public's health.
What is laboratory tests ?
A medical process that entails analyzing a sample of blood, urine, or another bodily fluid. Laboratory tests can aid in making a diagnosis, formulating a treatment plan, evaluating the efficacy of the strategy, or tracking the progression of the disease over time.
Diagnostic tests are categorized by the FDA according to their level of complexity, going from waived testing to high complexity tests.
Therefore, the FDA government agency is responsible for determining the clia complexity of all laboratory tests.
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an electron moves with a speed of 2.5×107 m/s in the directions shown in (figure 1) and (figure 2) below. a 0.60 t magnetic field points in the positive x-direction.
Answers
The force acting on an electron with a speed of \(2.5x10^7 m/s\) moving in a magnetic field of \(0.60 T\) pointing in the positive x-direction is \(3.0 x 10^-^1^7 N\)
When an electron is moving with a velocity v in a magnetic field B, a force F is exerted on the electron. This force is given by the formula: \(F = qvBsin\theta\) where q is the charge of the electron, v is the velocity of the electron, B is the strength of the magnetic field, and θ is the angle between the direction of motion of the electron and the magnetic field.
In this case, the electron is moving in a magnetic field of 0.60 T pointing in the positive x-direction, so θ = 90° and sinθ = 1.
Plugging in the given values, we get:
\(F = (1.6 x 10^-^1^9 C) (2.5 x 10^7 m/s) (0.60 T) (1)\)
\(= 3.0 x 10^-^1^7 N\)
Therefore, the force acting on the electron is \(3.0 x 10^-^1^7 N\)
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Can someone please help me. Complete the sentence.
The mutation caused the fgfria1 gene to encode a form of the Fgfriai protein that
could not send signals to the fish's body, so the common carp had
scales.
large, patchy
small, even
Answers
an individual taste receptor cell is only able to detect sugar (the molecule sucrose). therefore, the taste receptor cell an individual taste receptor cell is only able to detect sugar (the molecule sucrose). therefore, the taste receptor cell must have receptor proteins that interact with many different chemicals that all are interpreted by interneurons in the brain as sweet. must only have receptor proteins that can interact with sugar (sucrose). must communicate to interneurons in the brain that are able to interpret signals as multiple different tastes. must only communicate to interneurons in the brain that interpret signals as sweet.
Answers
Option 1 is Correct. An individual taste receptor cell can only detect sugar (the chemical sucrose) with the taste receptor cell (the molecule sucrose).
The T1R2/T1R3 receptor, which is expressed in the oral cavity and gives information on the calorie and macronutrient contents of ingested food, mediates the feeling of sweetness in food. To sense sweet, umami, and bitter tastes, type II cells contain G-protein coupled receptors (GPCRs).
A heterodimeric receptor made up of the two subunits T1R2 and T1R3 expressed in taste buds in the mouth is used to detect sweet-tasting substances. This single receptor is activated in order to detect any compounds that have a sweet taste, including carbs and noncaloric sweeteners.
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Correct Question:
An individual taste receptor cell is only able to detect sugar (the molecule sucrose) with
1. therefore, the taste receptor cell an individual taste receptor cell is only able to detect sugar (the molecule sucrose).
2. therefore, the taste receptor cell must have receptor proteins that interact with many different chemicals that all are interpreted by interneurons in the brain as sweet. must only have receptor proteins that can interact with sugar (sucrose).
3. must communicate to interneurons in the brain that are able to interpret signals as multiple different tastes.
4. must only communicate to interneurons in the brain that interpret signals as sweet.
The term meaning the death of bone tissue resulting from insufficient blood flow to an area of bone is.
Answers
Answer:
osteonecrosis
Explanation:
Osteonecrosis means death of bone tissue dueto an insuffficient blood supply, infection, malignancy, or trauma it may also be called AVN (avascular necrosis)
Name the possible air pollutants (gases) produced by this kind of structures
Answers
Pollutant Source at Building Sites construction debris Construction and demolition activities contribute to windblown dust issues on neighboring roads, which can linger in the air for days or even weeks. This dust is frequently referred to as fugitive dust.
What are contaminants and what kind are they?When dangerous substances are introduced into the ecosystem, pollution occurs. Pollutants are these damaging substances. Pollutants can be organic substances, like volcanic ash. They may also be the result of human activities, such as garbage or factory runoff.
How do natural pollutants work?Ash, soot, sulfur dioxide ( so2, salt spray, volcanoes, combustion gases, and other naturally occurring pollutants are only a few examples. Volcanic activity, forest fires, or grass fires all generate these toxins.
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complete the sentences from George Bernard Shaw's the doctors dilemma with word
s that are punctuated and spelled correctly this of course does amount to a sort of working of rule of thumb( options: conscience:
conscience.
conscience
conscience; ) but it means that you'll do anything good or ( options: bad:
bad,
bad;
bad. ) provided you get enough people to keep you accountants by doing it also it is the sort of conscience that makes it possible to keep order on a pirate (options: ship:
ship;
ship
ship. ) or in a troop of bringings it may be said that in the last analysis there is no other sort of Honor or conscience in existence that the ascent of the majority is only sanction known to ethics
Answers
Answer:
The correct answers are:
1. D : conscience;
2. B : bad,
3. D : ship,
Explanation:
The first answer requires a semicolon because we have two separate sentences, this is, two independent clauses, and in this case, we use the semicolon to connect them.
The second answer requires a comma as we have an appositive that does not provide essential information, so we separate it with a coma to designate additional information and maintain the structure of the sentence complete and clear.
The third answer requires a comma before the conjunction or because the rest of the sentence means the same as what precedes it. In this case, we use a comma as a sign of equivalence, to clarify that pirate ship is equivalent to a troop of brigands.
this is the correct answer
When a person drinks, the body absorbs alcohol, circulates it, and eventually eliminates it. Which of the following options lists the organ or system in the body where each of these steps takes place?
Answers
Organ in which alcohol absorption occurs: Stomach and small intestine walls Blood stream Elimination of alcohol from the body: Liver
When a person drinks, the body absorbs alcohol, circulates it, and eventually eliminates it. Below are the organs or systems in the body where each of these steps takes place:
The organ in which alcohol absorption occurs: Alcohol is absorbed by the stomach and small intestine walls.
The bloodstream is where alcohol absorption occurs. The blood circulates throughout the body and transports alcohol from the stomach and small intestines to other parts of the body.
When alcohol enters the bloodstream, it is diluted, making it easier for the liver to break it down and eliminate it.
In addition, when alcohol enters the bloodstream, it may be found in all tissues of the body, including the brain, kidneys, lungs, and heart. The elimination of alcohol from the body: The liver is the primary organ responsible for metabolizing, or breaking down, alcohol.
Alcohol is eliminated from the body by the liver. The liver breaks down alcohol using enzymes that convert it to acetaldehyde, which is a toxic substance. The liver then converts acetaldehyde into acetic acid, which is a less toxic substance. Finally, acetic acid is broken down into carbon dioxide and water, which are eliminated from the body through urine and exhalation.
Organ in which alcohol absorption occurs: Stomach and small intestine walls Blood stream Elimination of alcohol from the body: Liver
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how do shoebills respond to changes in external temperature when it's too cold
Answers
The adaptation of shoebills responds to changes in external temperature when it's too cold in their environment.
What changes occur to Shoebills in cold?Shoebills have adapted long toes with no webbing which helps them to balance on the swampy vegetation while stalking prey. There are few predators of shoebill storks. Young and eggs may be taken by nest predators but shoebill storks can defend their young and build nests in areas unreachable to many predators. Shoebills eat big fish such as lungfish and catfish This bird eats crocodiles and they hunt like bosses of the swamp. The Shoebill will stand there motionless like a statue. Some birds fluff up their feathers and open up their wings to catch a breeze that helping them cool.
So we can conclude that If the temperature is very cold then the Shoebill can't go outside.
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How can you use a pedigree chart to track inherited traits (short and strait to the point) (I'LL GIVE 20 POINTS!!!!)
Answers
Answer:
Short and sweet answer below!
Explanation:
A pedigree helps to determine which individuals have the trait, if the trait is dominant or recessive, and whether the trait is autosomal or sex-linked (how the trait is passed down).
Hope this helps! :)