Which of the Following Describes the Effect of End- Diastolic

question 45

Multiple Choice

Which of the following describes the effect of end- diastolic volume on stroke volume?

• A)A decrease in end- diastolic volume creates a vacuum drawing more blood into the ventricle increasing stroke volume.
• B)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.
• C)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.
• D)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.
• 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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