Electrical impulses make your heart beat, moving blood through these chambers. Your brain and nervous system direct your heart’s function. What is the function of the heart? Your heart’s main …

Dec 6, 2025 · Heart, organ that serves as a pump to circulate the blood. It may be as simple as a straight tube, as in spiders and annelid worms, or as complex as the four-chambered double pump …

In humans, deoxygenated blood enters the heart through the right atrium from the superior and inferior venae cavae and passes to the right ventricle. From here, it is pumped into pulmonary circulation to …

The heart is a muscular organ situated in the chest just behind and slightly toward the left of the breastbone. The heart works all the time, pumping blood through the network of blood vessels called …

Aug 22, 2024 · As the heart beats, it pumps blood through a system of blood vessels called the circulatory system. The vessels are elastic tubes that carry blood to every part of the body. Blood is …

It is a powerful fist-sized muscle that pumps blood around the body through a network of blood vessels – together, the heart and blood vessels make up the body’s cardiovascular system. Our hearts beat on …

Jun 27, 2025 · It pumps blood through arteries to deliver oxygen to organs and tissues around the body, and through veins to return "used" blood back to the heart. The heart is located near the center of the...

Find out more about the anatomy and function of the heart and circulatory system. Have a look through our pictures of the heart and learn more about what it takes to keep our blood pumping.

Apr 13, 2025 · In this deep dive, we’ll journey through the anatomy and function of the heart, explore how it orchestrates circulation, and understand why this organ, no bigger than your fist, holds the …

May 14, 2018 · Watch animations on blood flow and your heart valves. The American Heart Association explains how the healthy heart works.