Heart Actions

Like any muscle, the heart can either contract or relax. Because blood always flows from areas of higher blood pressure to areas of lower blood pressure, blood flows from the veins back to the relaxed heart, but away from the contracting heart through the arteries. Heart valves open and close in response to pressure changes that occur within the beating heart, and ensure that blood flow through the heart in response to contraction and relaxation is always in the right direction. The events that occur, including relaxation and contraction of both atria and ventricles, constitute a cardiac cycle (kar'de-ak si'kl).

Blood Pressure Health

Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

Get My Free Ebook


Post a comment