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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. [3] In humans, other mammals, and birds, the heart is divided into four chambers: upper left and right atria and lower left and right ventricles.
Vor 2 Tagen · Learn about the structure and function of the human heart, a four-chambered double pump that circulates blood through the body. Explore the cardiac cycle, electrical conduction, valves, sounds, and diseases of the heart.
- The Editors of Encyclopaedia Britannica
- In humans, the heart is situated between the two lungs and slightly to the left of center, behind the breastbone. It rests on the diaphragm, the mu...
- The heart consists of several layers of a tough muscular wall, the myocardium. A thin layer of tissue, the pericardium, covers the outside, and ano...
- The pumping of the heart, or the heartbeat, is caused by alternating contractions and relaxations of the myocardium. These contractions are stimula...
- The rhythmic noises accompanying the heartbeat are called heart sounds. The two distinct sounds are heard, a low, slightly prolonged “lub” (first s...
Anatomy of the human heart. The heart is a muscular organ situated in the mediastinum. It consists of four chambers, four valves, two main arteries (the coronary arteries), and the conduction system.
3. Nov. 2023 · Learn about the heart anatomy, including its chambers, valves, blood flow, and coronary circulation. See diagrams, videos, quizzes, and clinical notes on the heart structure and functions.
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26. Jan. 2024 · Learn about the heart, the main organ of your cardiovascular system. Find out how it works, what parts it has, and what conditions can affect it.
30. Sept. 2020 · Learn about the structure, function, and blood flow of the human heart, a muscular organ that pumps blood throughout the body. Find out how the heart valves, electrical system, and blood vessels work together to keep you alive.
24. März 2022 · Learn how your heart is structured and how it pumps blood through your body. See images and animations of the heart chambers, valves, tissue, and blood flow.
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