Which of the following circulatory changes are expected during exercise?
I.Rate and strength of cardiac contractions increase
II.Blood vessels in working muscles constrict
III.Blood vessels of peripheral vascular system dilate
IV.Blood vessel of heart and brain constrict
A) I only
B) I, II, III and IV
C) I, II, and III only
D) II only

Question

Quizplus · Accepted Answer

During exercise, the rate and strength of cardiac contractions increase to pump more blood and thus oxygen and nutrients to the muscles in use. Blood vessels in working muscles actually dilate (not constrict) to increase blood flow, and while blood vessels in the peripheral vascular system may adjust to help direct more blood to working muscles, the vessels of the heart and brain do not constrict; they may dilate to ensure these critical organs are well supplied.

Which of the Following Circulatory Changes Are Expected During Exercise