Question

PLEASE ANSWER 28 AND 29

28. Compared to the resting state, which is true of the cardiac cycle during exercise?

    a. Even though heart rate increases, systole and diastole remain the same

    b. Systole remains the same but diastole decreases.

    c. Systole increases and diastole remains the same.

    d. Both systole and diastole decrease, but there is a greater decrease in diastole.

        

29. The three principal mechanisms for increasing venous return during exercise are

   a. an increase in stroke volume, HR, and compliance of the vascular system

   b. venoconstriction, pumping action of muscle, and the pumping action of the respiratory

       system

   c. an increase in vascular resistance, an increase in HR, and a decrease in blood pressure

   d. none of the above are correct

Answer 1

28.(d) Both systole and diastole decrease ,but there is greater decrease in diastole.

Reason:

Answer:(b) venoconstriction, pumping action of muscles, pumping action of respiratory.

Reason: