Arrange these statements into the most appropriate order, reflecting what happens following initiation of the Valsalva maneuver:
1. Decrease in venous return lowers left ventricular stroke volume and arterial blood pressure.
2. Initial increase in left ventricular stroke volume raises systemic blood pressure.
3. Initial increase in left ventricular volume results in increase in left ventricular stroke volume. 4. Intrathoracic pressure is raised by expiring against a closed glottis.
5. Raised intrathoracic pressure decreases venous return to the right atrium from the systemic circulation.
6. Raised intrathoracic pressure initially increases venous return to the left atrium from the lungs. 7. Raised systemic blood pressure reflexively decreases heart rate.
8. This results in peripheral vasoconstriction and increasing heart rate.
Answers
1. When Valsalva maneuvre is done, then intrathoracic pressure is increased as the expiration is done forcibly against the closed glottis.
2. Raised intrathoracic pressure compresses the lungs and blood to left atrium is increased. Left atrium sends this blood to the left ventricle.
3. When blood is increased in left ventricle, it will contract more efficiently causing more stroke volume and cardiac output.
4. More cardiac output increases the systolic blood pressure.
5. Intrathoracic pressure is increased which further compresses the vena cava and venous return to right atrium is decreased.
6. Decrease in venous return means less blood will go to the left ventricle. Left preload causes less contraction and stroke volume is reduced. Cardiac output reduces.
7. To compensate for decreased cardiac output, the vessels undergo vasoconstriction and the heart rate is also increased.
8. The raised systolic blood pressure reflexively decrease the raised heart rate and heart rate becomes Normal.
Intrathoracic pressure influences venous go back and therefore cardiac output and arterial pressure. Inspiration drops intrathoracic stress, dilates the thoracic vena cava, and acutely decreases atrial filling. Cardiac output falls, and therefore arterial stress falls.
High quality-pressure air flow increases intrathoracic stress. when you consider that diaphragmatic descent will increase intra-belly strain, the decrease inside the strain gradient for venous return is much less than would in any other case occur if the only exchange have been an boom in proper atrial stress.
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Related Questions
You are standing by a cliff far away from the ocean. You see a sedimentary layer with shells in it. You
ure told the shells are from oceanic organisms. How do you think this layer formed?
Answers
The layer would be formed by the strong currents as well as by waves slowly moving the shells to the share along with the other shells creating a layer of the shell as well as cliff of the rock.
What is sedimentary rock?Sedimentary rocks has been generally made up from the directly heat and these are formed when the deposition or the accumulation of the particles that are the organic or the minerals at the surface of Earth, later followed by the process of the cementation. The main feature of the sedimentary rock has been that they are formed in the multiple layers.The rocks has been made up of more than one mineral and the size of some rocks are small or big it depends upon their constituents.
Rock has been defined as when the mineral grains has been combined in the solid form and later they grow or take the shape of the cemented form has been known as the rocks.The rocks has been made up of more than one mineral and the size of the rocks are smaller or bigger it has been depends upon their constituents. Rocks has been divided on the basis of their formation by Geologists.There are mainly three kinds of rock and these are metamorphic, igneous, and sedimentary. The most durable substance is stone.
Therefore, The layer would be formed by the strong currents as well as by waves slowly moving the shells to the share along with the other shells creating a layer of the shell as well as cliff of the rock.
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When an egg and sperm form an embryo, the offspring that is formed will have genetic traits that are
A. Inherited from only one parent.
B. Created by the environment.
C. Passes in from two parents.
D. Learned from sibling
Answers
Answer:
C.
Explanation:
In reproduction, the offspring will will have genetic traits from both the mother and father--as half of out mother's DNA + half of our father's DNA = our full set of DNA.
The offspring have genetic traits that are Passes in from two parents.
When the two haploid gametes fuse they form a diploid embryo that have the characters from both the parents.Explain genetic traits?A genetic trait is a specific characteristics of an individual that are determines by the genes, environmental factors or by the combination of both. Traits can be :-
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What can humans do to make the renewable forest resources last longer?
Answers
Answer:
Sustainable forestry practices: This involves using techniques such as selective logging and reforestation to ensure that forest resources are used in a responsible and sustainable manner, without damaging the ecosystem.
Protection of forests: Protecting forests from illegal logging, fires, and other forms of destruction can help to ensure that these resources remain intact for future generations.
Reduced deforestation: Deforestation is a major contributor to the loss of forest resources, so reducing deforestation is crucial in maintaining forest cover. This can be achieved by promoting sustainable agriculture and other land-use practices that reduce the need to cut down forests.
Efficient use of forest products: Making more efficient use of forest products, such as paper and wood, can reduce the amount of resources required and help to extend their lifespan.
Increased reforestation: Planting new trees can help to replace those that have been lost, and increase the overall forest cover.
Restoration of degraded forests: Restoring degraded forests can help to rebuild the health of these ecosystems and support the recovery of forest resources.
Explanation:
Answer:
Reducing the use of forest resources can enable humans to make it last longer.
Explanation:
A reduction in the use of forest resources can help with the mitigation process. Mitigation can be defined as the reduction of loss during any natural disaster. Forest is a rich source of oxygen, so we have to be very careful about the conservation of forest resources. It also serves numerous others functions like it can be used as a shelter for different animals and birds. We have to minimize the use of forest products.
4. The ATP yield from 2 moles of mitochondrial NADH under aerobic conditions in a eukaryotic cell would be: which option is correct a) 1 mole of ATP b) 2 moles of ATP c) 3 moles of ATP d) 4 moles of ATP e) 6 moles of ATP
Answers
The ATP yield from 2 moles of mitochondrial NADH under aerobic conditions in a eukaryotic cell is approximately 4 moles of ATP.
During oxidative phosphorylation, each mole of NADH can generate around 2.5 to 3 moles of ATP. Therefore, for 2 moles of NADH, the total ATP production would be in the range of 4 to 6 moles of ATP. While the more precise estimate falls within the 4 to 6 moles range, the closest option provided is 4 moles of ATP. It is important to note that the exact ATP yield can vary depending on factors such as the efficiency of the electron transport chain and the specific conditions within the cell.Since there are 2 moles of mitochondrial NADH, the total ATP yield would be around 4 to 6 moles of ATP. However, the most accurate option among the given choices is 4 moles of ATP.
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1. Causes more than $1 bilion in crop and
property damage each year
Answers
Answer:
False
Explanation:
your welcome hehe
Answer:
False
Explanation:
It is actually true
What are the conditions required for natural selection? Check all that apply.
Answers
The conditions required for natural selection are the ability to adapt, the variation, and the reproduction pattern, and all these include and allow the natural selection to happen and the species to survive in the new environment.
What is the importance of adaptation in the natural selection process?Natural selection selects the strongest individual out of all, and those who can survive in this natural selection continue to evolve and reproduce, and many factors influence it, such as the inheritance pattern, variation, etc.
Hence, the conditions required for natural selection are the ability to adapt, the variation, and the reproduction pattern, and all these include and allow the natural selection to happen and the species to survive in the new environment.
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Where does translation occur in an animal cell
Answers
Lab Intro - The Metric System
Exercise A - Measurement or distance
Someone help please
Answers
The metric system is a system of measurement that is utilized throughout the world. The fundamental units of the metric system are meter, gram, and liter. In this system, prefixes are used to represent measurements that are bigger or smaller than the fundamental units.
The prefix “kilo-,” for example, indicates a measurement that is a thousand times bigger than the fundamental unit. Lab Intro - The Metric System Exercise A - Measurement or Distance The metric system is used to measure length or distance.
The standard unit of length in the metric system is the meter, which is represented by the symbol “m.” The metric system is used to measure distances or lengths that vary from millimeters (mm) to kilometers (km).In order to determine measurements in the metric system, the fundamental units are combined with prefixes.
For example, one centimeter (cm) is equal to 1/100th of a meter, while one millimeter (mm) is equal to 1/1000th of a meter. One kilometer (km), on the other hand, is equal to a thousand meters (m).
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Question 1 (1 point) Mr. Crab loves to fry food. But the grease often splatters everywhere making a big mess. He decides to set up a test in order to determine which dish soap is best at removing grease. He washes 20 greasy dishes with standard Dawn dish soap and washes another 20 greasy dishes in his own Super Awesome Amazing dish soap. What is the independent variable in this experiment?
How much grease is removed
How quickly the dishes were cleaned
The brand of dish soap
Answers
The independent variable is how much grease is being removed. So the correct option is A.
What is meant by independent variables?Any object, idea, time period, or any of the categories that are being measured will be called a variable.
A variable that is not changed by any other factors of the experiment is called an independent variable. In simple words, this is a factor that is independent of the other variables.
For example, in the above me experiment, the amount of grease removed will be the same. Even if a soap takes a long time and effort to remove grease, it will remove all the grease. Thus the amount of grease removed is an independent variable in this case.
However, a variable that is affected by the other variables in the experiment is called a dependent variable. For example, the soap which is not efficient will take more time to remove grease than the soap which is efficient.
Here, the type of soap is a variable that is affecting the time taken to clean the dishes. The type of soap and the time taken to remove the grease are dependent variables. The amount of grease removed is an independent variable.
Therefore the correct option is A.
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The transfer RNA shown here would transport the amino acid
(lys) lysine
(pro) proline
(try) tryptophan
(gly) glycine
Answers
The transfer RNA shown here would transport the amino acid is option B: (pro) proline
What is the transfer RNAtRNA transports amino acids to the ribosome for protein synthesis, guided by mRNA sequence. Each tRNA binds an amino acid and mRNA codon via specific structure. This tRNA charging or aminoacylation is done by aminoacyl-tRNA synthetases.
tRNA recognizes codons & amino acids via a three-nucleotide anticodon sequence that binds to mRNA, ensuring correct amino acid addition to protein chain. tRNA is crucial for translating genetic info to proteins, accurately recognizing and transporting amino acids for proper cell and organism function.
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What is a solution's absorbance, if its molarity is 0.18M?
Answers
If a solution's molarity is 0.18M, then its absorbance will be 0.5.
What is molarity?A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration. The number of moles per liter, denoted by the unit symbol mol/L or mol/dm³ in SI units, is the most often used unit denoting molarity in chemistry.
Molarity is directly proportional to the absorbance of any solution, if molarity increases, absorbance also increases. Therefore, if a solution's molarity is 0.18M, then its absorbance will be 0.5.
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Leaves are a plant's major site of photosynthesis and gas exchange
with the atmosphere. True or False?
Answers
Answer:
True
Explanation:
The cells in a middle layer of leaf tissue called the mesophyll are the primary site of photosynthesis. Small pores called stomata—singular, stoma—are found on the surface of leaves in most plants, and they let carbon dioxide diffuse into the mesophyll layer and oxygen diffuse out.
Looking at the Punnett square, list the possible phenotypes and frequencies of
Martha and John's children? *
A
a
a
Аа
аа
а
Аа
аа
Your answer
Answers
Answer:
Phenotypes:
Aa with a frequency of 2
aa with a frequency of 2
The children have equal chances of having aa or Aa
Which statement about vacuoles is true?
Only plant cells contain vacuoles.
Only animal cells contain vacuoles.
Vacuoles are larger in plant cells than in animal cells.
Vacuoles are larger in animal cells than in plant cells
Answers
What is the importance of photosynthesis and cellular respiration for an organism?
Answers
Answer:
the exchange of oxygen and carbon dioxide between living organisms and the environment.
Explanation:
Identify a difference between the covalent bonds withing a water molecule
Answers
Covalent bonding hold water together. The atoms share electrons in covalent connections. In water, oxygen is chemically joined to two hydrogen atoms. The oxygen and hydrogen atoms do not share the electrons equally.
Explain about the covalent bonds?One or more pairs of electrons from each atom are shared by the other atoms to form a covalent link. The two atomic nuclei are pulling these electrons in opposite directions. When the gap between two atoms' electronegativities is too narrow for an electron transfer to take place and form ions, a covalent bond is created.
An atom can establish covalent and ionic bonds, which are the two types of bonds that are most common. When two or more atoms are bonded together covalently, electrons are shared. When two or more ions join together, they form ionic bonds that are held together by the presence of opposing charges.
Sharing of electron pair between atoms is a component of covalent bonds. A nonpolar covalent bond is created when electron pairs from atoms with similar or equal electronegativity are shared.
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what organizational level can produce the most viable offspring
Answers
The organizational level of an organism can produce viable offspring and thus perpetuate the genetic material in the descendence.
What is the organizational level of an organism?The organizational level of an organism is referred to the most inclusive unity of life capable pr remaining independent in environmental conditions, which carries our many metabolic functions including the preproduction to perpetuate the genetic information of the species.
Therefore, with this data, we can see that the organizational level of the organism can reproduce and thus is the minor level to produce offspring.
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look at the picture
Answers
I will leave your question unanswered. Thanks for the points I stole from you!
State four benefits of the democratic government
Answers
Answer:
Representation: In a democratic government, citizens have the ability to vote and elect representatives who will make decisions on their behalf. This ensures that every citizen has a voice and that their concerns and interests are taken into account.
Protection of individual rights: Democratic governments typically have legal systems in place that protect individual rights such as freedom of speech, religion, and assembly. These protections ensure that citizens can express their opinions and beliefs without fear of persecution or discrimination.
Accountability: In a democratic government, elected officials are accountable to the people they represent. If they fail to fulfill their duties or act in a way that goes against the interests of their constituents, they can be removed from office through a fair and transparent process.
Stability: Democratic governments tend to be more stable and peaceful than authoritarian regimes. This is because they are based on the rule of law and the principle of peaceful transfer of power. When citizens have a say in how their country is governed, they are less likely to resort to violence or rebellion.
Explanation:
Four benefits of democratic government are:
Citizen participation and representationProtection of individual rights and freedomsFair and transparent decision-makingPeaceful and orderly transfer of power.What is a democratic government?
A democratic government is a system of governance where power is held by the people through free and fair elections. It is based on the principle of popular sovereignty, where the will of the majority determines political decision-making.
One of the key benefits of democratic government is citizen participation and representation. Democratic governments offer opportunities for people to have a say in decisions that affect their lives through voting, activism, and advocacy. Another benefit is the protection of individual rights and freedoms. Democracies ensure that basic human rights, such as freedom of speech and assembly, are respected and upheld.
Democracies also promote fair and transparent decision-making, with elected officials being held accountable to the people. This helps to prevent corruption and abuse of power. Additionally, democratic governments promote peaceful and orderly transfer of power, which reduces the likelihood of political instability and violence. Overall, democratic governments provide a framework for promoting equality, justice, and liberty for all citizens.
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20
2.
o
QUESTION 2 (ENZYME ACTIVITY]
The investigation was carried out to determine the effect of a detergent containing fat-
digesting enzymes on a fat stain.
The procedure was as follows:
Two identical cloths were used
Cloths A and B had identical fat stains.
Cloth A was washed using a detergent not containing fat-digesting enzymes for five
minutes at 37°C.
Cloth B was washed using a detergent containing fat-digesting enzymes for five minutes
at 37°C.
Answers
Answer:
Explanation:
Why are enzymes added to washing powder, and how do they work? Carry out some simple experiments to investigate this further. ... pepsin, a digestive enzyme in the stomach, works best at pH 2. ... People have been experimenting with ways to use the power of enzymes to clean clothing for a long time
Nerve cells can form many branches. How does this relate to their function?
A) they need a shape that allows them to hook onto structures
B) they need a large surface area
C) they form networks with other nerve cells
Answers
An electrically excitable cell known as a nerve cell uses synapses, which are specialized connections, to communicate with other cells. With the exception of sponges and placozoa, the neuron is the primary element of nervous tissue in all animals.
Plants and fungus are examples of non-animals that lack nerve cells. Dendrites are the many, brief branching found on nerve cells. Depending on the sort of cell it is affiliated with, dendrites may branch extensively. The axon of another nerve sends electrical signals to dendrites. The cell body or a portion of it is then where it accumulates before transmission. The quantity, branching, and placement of the dendrites or projections that make up a nerve cell, collectively known as arborization, determine the structure of the nerve cell. Their ability to communicate with their environment and other nerve cells or neurons, as well as their responsibilities in computation, are determined by this.
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what is geological substratum
Answers
Answer:
Explanation:
Geological substratum refers to the solid rock or layer of Earth's crust that lies beneath the soil, sediment, or other surface materials.
Hope it helps!!
Describe the mechanism of glycolysis in detail
Answers
The process of Glycolysis is a catabolic process in which two molecules glucose goes through a ten- step pathway and yield two molecules of pyruvate . It is a major part of carbohydrate metabolism .
Mechanism Of Glycolysis
The glycolysis is also known as EMP pathway and it is involved in both aerobic and anaerobic conditions .There are two phases in the mechanism of glycolysis in which 5 reactions takes place in each phase and the process of glycolysis takes place in cytosol
Preparatory phase refers to the generation of two molecules of glyceraldehyde 3-phosphate from one molecule of glucose which further goes into the payoff phase . In this phase two molecules of ATP are used and two regulatory enzymes were involved in this reaction .
Payoff phase refers to the further break down of two molecules of glyceraldehyde3-phosphate to two molecules of pyruvate . In this phase four molecules of ATP and two molecules of NADH are generated . In this phase only one regulatory enzyme is involved which is the breakdown of PEP to pyruvate .
Both the phases of glycolysis takes place in the cytoplasm and there are three enzymes that involved in regulating the glycolytic pathway .This process is also known as the catabolic process .
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How are the graphs of a body chemical controlled by negative feedback and a body chemical controlled by positive feedback similar? How are they different?
Answers
Answer:
brainliest plzzzzz
Explanation:
There is a proper mechanism of controlling the levels of various kinds of hormones and chemicals in our body called as positive feedback and negative feedback.
In a very simple language you can understand it as whenever there is a release of a particular hormone or chemical inside the body in very huge amount then the negative feedback of the body is activated the production of that particular hormone or chemical is stopped and vice -versa for negative feedback.
Explanation:positive feedback and negative both the feedback mechanism are achieved to maintain the proper homeostasis.
Example: release of clotting factor after blood loss is a positive feedback and a hormone is released and then suddenly there is a increase in hormone b, then the amount of hormone a will decrease this is a negative feedback.
GIVING BRAINLEST PLEASE HELP
if all lakes have algae, why would one lake be safe to swim in and another be considered toxic?
Answers
Answer:
Because certain varieties of blue-green algae can produce toxins that are linked to illness
Explanation:
Answer:
One lake would be safe to swim in because it doesn't have algae.
Explanation:
Lakes with algae can make people sick. This is bad and harmful to humans and pets. you can get sick in a lake that has algae in it by:
Swimming, kayaking, fishing, wading, or doing similar activities in contaminated water.Breathing in tiny water droplets, mist, or wind-blown sea spray that contains toxins.3. Drinking contaminated water
4. Eating contaminated seafood (fish or. shellfish).
i hope this helps
Give five points about host cell - Ecoli (Biotechnology)
Answers
\({ \boxed{ \red{ \sf{host \: cell - Ecoli}}}}\)
# Multiplies once in every twenty minutes.
# Short lifespan.
# Contains plasmid used as vector in genetic engineering.
# Gram negative and non-capsulated bacteria.
# Sensitive to wide range of antibodies.
Provide some natural causes and human causes of deforestation.
Answers
Natural causes of deforestation include:
1. Typhoons or hurricanes
2. Floods
3. Forest fires due to drought
4. Parasites (termites)
Human activities of deforestation include:
1. Land development (Urbanization)
2. Agricultural expansion
3. Mining
4. Illegal logging
Which of the following statements accurately describe the purpose of the cell cycle
Answers
Answer:
i don't know
Explanation:
I am sorry
Describe the first interaction that triggers signaling to begin in a target cell.
Answers
Answer:
Target cell: this cell has a receptor that can bind the ligand. The ligand binds to the receptor and triggers a signaling cascade inside the cell, leading to a response. ... When a signaling molecule binds to its receptor, it alters the shape or activity of the receptor, triggering a change inside of the cell.
Explanation:
Someone plzzzz plzz plz help me I’ll cash app 100$ to whoever gets it right ! Plz
Answers
Answer:
Don't cashapp me but im guessing BB just wait for other people to answer bc im not a 100% sure
Explanation: