Once the warm-up portion of an exercise class is over, it's time to elevate heart rates, amp up the intensity and create group participation. Changes in music and choreography trigger an increase in sympathetic activity, which then creates WHICH of the following cardiovascular change(s):
A)A decrease in stroke volume
B)A decrease in heart rate and contractility
C)An increase in heart rate and contractility
D)Redistribution of blood flow to the heart and lungs

Question

Quizplus · Accepted Answer

Exercise causes an increase in sympathetic activity, which causes a cascade of release of the hormones epinephrine and norepinephrine. These catecholamines increase both the heart's rate and the force of heart contractility. The resulting increase in cardiac output, along with redistribution of blood flow to the active skeletal muscle help the body meet the increased energy demands of exercise.

Once the Warm-Up Portion of an Exercise Class Is Over