In humans, the heart is approximately the size of a closed fist and is located between the lungs, in the middle compartment of the chest, called the mediastinum. [4]

Mar 1, 2026 · 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 …

Your heart is the main organ of your cardiovascular system, a network of blood vessels that pumps blood throughout your body.

Aug 22, 2024 · Learn about the anatomy of the heart and how its chambers, valves, and vessels work together to maintain effective blood circulation throughout the body to sustain life.

5 days ago · Help us create a healthier world free of heart disease and stroke. Since the American Heart Association’s founding in 1924, deaths from cardiovascular diseases have been cut in half. And yet, …

Jan 8, 2025 · Learn about the heart's anatomy, how it functions, blood flow through the heart and lungs, its location, artery appearance, and how it beats.

Mar 24, 2022 · This image shows the four chambers of the heart and the direction that blood flows through the heart. Oxygen-poor blood, shown in blue-purple, flows into the heart and is pumped out …

Your heart has four compartments, or chambers, that constantly pump blood to deliver oxygen and nutrients to the body. Learn more about how your heart works.

Dec 14, 2025 · Blood is carried through the body in blood vessels called arteries and veins. The process of moving blood through the body is called circulation. Together, the heart and vessels make up the …

2 days ago · Explore the anatomy and core functions of the heart with Innerbody's interactive 3D model.