Question

1. during __, the ventricles contract and blood pumps out of the heart. during __, the ventricles relax and blood flows into the heart.

a. diastole, systole
b. systole, diastole
c. inhalation, exhalation
d. cardiac circulation, pulmonary circulation

Explanation:

Systole is the phase when heart - muscle contracts, pumping blood out. Diastole is the phase when the heart muscle relaxes, allowing blood to flow in. Inhalation and exhalation are related to breathing, not heart function. Cardiac and pulmonary circulation refer to blood - flow pathways, not the contraction/relaxation phases of the heart.

Answer:

B. systole, diastole