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]

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 …

Jan 26, 2024 · 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.

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 …

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 …

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.

Sep 3, 2025 · The anatomy of the human heart starts with understanding each of the four chambers. Learn about the upper, lower, right, and left parts of heart anatomy.

May 14, 2018 · The normal heart is a strong, hard-working pump made of muscle tissue. It's about the size of a person's fist. The heart has four chambers. The upper two chambers are the atria, and the …

How the Normal Heart Works The heart is a large muscular organ with the very important job of circulating blood through the blood vessels to the body. Located in the center of the chest, the heart …