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. stroke volume decreases
c. venous return decreases.
d. preload increases.

d. Preload increases.

Explanation:

Preload is affected by the rate of venous return and the venous blood pressure , which are affected by the volume of circulating blood and venous tone .

The preload is related to ventricular end - diastolic volume ,

The higher end - diastolic volume have a higher preload .

Preload is approximated via  echocardiographic measurement end diastolic volume or EDV.

Preload is increased by exercising , or increase in blood pressure and neuroendocrine excitement .

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