During increased exercise,
A) vasoconstriction occurs at the active skeletal muscles.
B) venous return increases.
C) cardiac output decreases.
D) stroke volume decreases.
E) All of the answers are correct.

Question

Quizplus · Accepted Answer

During increased exercise, venous return increases due to increased skeletal muscle contractions and respiratory movements. This in turn leads to an increased preload on the heart, which can lead to an increased cardiac output and stroke volume. Vasoconstriction occurs in other areas of the body to redirect blood flow towards the active skeletal muscles, but not at the active skeletal muscles themselves. Therefore, choice A is incorrect. Choices C and D are also incorrect, as cardiac output and stroke volume typically increase during exercise.

During Increased Exercise