The heart pumps blood to deliver oxygen to the entire body. So, where does the heart itself, which is constantly working, ...

Circulating Blood with Two Pumps and Four ValvesThe heart is a pump that uses muscle contractions to pressurize blood and ...

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 ...

The heart is often described in gentle terms, a fist-sized muscle beating quietly in the chest. The reality is far more forceful, because that muscle is a relentless pressure pump powerful enough that ...

Explains how a tiny pump inside the heart can keep blood circulating while reducing the heart’s workload.