Question

as exercise progresses, muscular activity ____ venous return. this increases the ____ on the right ventricle.
multiple choice
decreases; preload
increases; afterload
increases; preload
decreases; afterload
decreases; midload

Explanation:

During exercise, muscular activity compresses veins, which increases venous return. Pre - load is the amount of blood in the ventricles just before they contract. An increase in venous return means more blood in the right ventricle (pre - load increases). After - load is the pressure the ventricle must overcome to eject blood, which is not directly related to venous return in this context. Mid - load is not a standard term in this physiological context.

Answer:

increases; preload