Biology, 11.04.2020 05:11 hongkongbrat6840

Which of the following describes the effect of end-diastolic volume on stroke volume?
a) An increase in end-diastolic volume stretches ventricular muscle cells to lengths closer to optimum, increasing the strength of contraction and thereby increasing stroke volume.
b) A decrease in end-diastolic volume allows cardiac muscle to relax, conserving energy for the next contraction, thereby increasing stroke volume of that next contraction.
c) A decrease in end-diastolic volume creates a vacuum drawing more blood into the ventricle increasing stroke volume.
d) A decrease in end-diastolic volume allows ventricular muscle cells to relax more during diastole, allowing more blood to return to the heart increasing stroke volume.
e) An increase in end-diastolic volume stretches ventricular muscle cells to lengths greater than optimum, decreasing the strength of contraction and thereby decreasing stroke volume.

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Answer from: fjdkj

a) is the correct option

Explanation:

The heart consists of four chambers: two atria and two ventricles and also contain valves that open and close in sequence so that blood flows in one direction through the atria and ventriclesThe veins carry oxygen-poor blood into the right atrium, which connects to the right ventricle; from here, the heart pumps blood into the lungs for oxygenationThe newly oxygenated blood enters the left atrium and flows into the left ventricle, which contracts, forcing blood up through the aortaThe aorta is the largest artery in the body, and it supplies the entire body with oxygen-rich bloodDiastole occurs when the heart muscle relaxes, and the chambers fill with blood, blood pressure decreases during diastoleSystole occurs when the ventricles contract, pushing blood out of the right ventricle into the lungs and out of the left ventricle to the rest of the body, blood pressure increases during systoleEnd-diastolic volume is the amount of blood that is in the ventricles before the heart contractsDoctors use both end-diastolic volume and end-systolic volume to calculate stroke volumeEnd-systolic volume is the amount of blood remaining in the ventricle at the end of systole, after the heart has contracted Stroke volume is the quantity of blood that the heart pumps out of the left ventricle with each beatThe formula for stroke volume can be written as: Stroke volume = end-diastolic volume – end-systolic volume

Answer from: Quest

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.

Answer from: Quest

c. the initial amount of money placed in the savings account

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Which of the following describes the effect of end-diastolic volume on stroke volume?
a) An i...