Exercise results in skeletal muscles compressing veins which encourages blood to return to the heart. In this scenario, which of the following is correct?
A) end diastolic volume (EDV) decreases
B) venous return decreases
C) stroke volume decreases
D) preload increases

Question

Quizplus · Accepted Answer

Preload is the amount of blood returning to the heart which stretches the ventricles and prepares them for contraction. When skeletal muscles compress veins, there is an increase in venous return which leads to an increase in preload. This allows for a stronger ventricular contraction and an increase in stroke volume. Therefore, choices A, B, and C are incorrect.

Exercise Results in Skeletal Muscles Compressing Veins Which Encourages Blood