Ejection fraction (EF) measures how well the heart pumps blood. A normal EF is 55% to 70%, meaning the heart pumps out at least half of the blood in its left ventricle with each beat. An EF below 50% ...

The heart is the body's hardest-working muscle. Whether you're awake or asleep, or exercising or resting, your heart is always at work. It pumps blood through arteries to deliver oxygen to organs and ...

Your heart is a muscular organ that helps circulate your blood, which delivers oxygen and nutrients to your tissues. There are four chambers and four valves in your heart, and each ensures proper ...

Thu, January 8, 2026 at 1:56 PM UTC The body requires the teamwork of many physiological systems to function well, and the heart is central to the entire operation. Heart health describes how ...

Heart health is about more than just the heart itself. It’s a two-way street between the heart and the rest of the body. However, many U.S. adults aren’t aware of the connection between organs.

Alexandria Nyembwe is a registered nurse and health writer. She has worked in street medicine serving populations experiencing homelessness in Skid Row Los Angeles as well as in cardiovascular care in ...