Which of the following statements is true? A. an increase in end-diastolic volum

Question

Which of the following statements is true? A. an increase in end-diastolic volume will increase the strength of cardiac contraction and thereby increase stroke volume. B. an increase in end-diastolic will decrease the strength of cardiac contraction thereby decrease stroke volume. C. a decrease in end-diastolic volume will allow more blood to return to the heart, thus increasing stroke volume. D. a decrease in end-diastolic volume will allow the cardiac muscle to relax, thus allowing them to conserve energy for the next cardiac contraction, thereby increasing stroke volume.

Explanation / Answer

a.an increase in end-diastolic volume will increase the strength of cardiac contraction and thereby increase stroke volume.

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.

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