Question

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

Explanation:

Muscular activity during exercise squeezes veins, increasing venous return. An increase in venous return leads to an increase in pre - load (the amount of blood in the ventricle at the end of diastole). Afterload is related to the resistance against which the heart has to pump, and it is not directly affected in this context as described in the question.

Answer:

None of the provided options are correct. The correct answer should be "increases; preload"