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Jul 30, 2021 · The cardiovascular system consists of the heart, veins, arteries, and capillaries. These components make up two circulatory systems: the systemic and pulmonary circulatory systems.
Oct 4, 2019 · Heart Definition. The heart is a muscular organ that pumps blood throughout the body. It is located in the middle cavity of the chest, between the lungs. In most people, the heart is located on the left side of the chest, beneath the breastbone. The heart is composed of smooth muscle.
Sep 25, 2024 · heart, organ that serves as a pump to circulate the blood. It may be a straight tube, as in spiders and annelid worms, or a somewhat more elaborate structure with one or more receiving chambers (atria) and a main pumping chamber (ventricle), as in mollusks.
- 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...
Jun 11, 2024 · The heart is a vital, fist-sized muscular organ located slightly on the left side of the chest. It consists of four main chambers: two atria and two ventricles. Understanding its basic anatomy is crucial to understanding how it functions.
Nov 3, 2023 · Heart valves separate atria from ventricles, and ventricles from great vessels. The valves incorporate two or three leaflets (cusps) around the atrioventricular orifices and the roots of great vessels. The cusps are pushed open to allow blood flow in one direction, and then closed to seal the orifices and prevent the backflow of blood.
Jul 13, 2023 · Overview of the main coronary arteries and cardiac veins. The heart is a muscular, four-chambered organ that is responsible for distributing blood throughout the body. The continuous activity of the heart creates a large demand for nutrients to be delivered to cardiac tissue and for waste to be removed.
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Aug 26, 2024 · It has four chambers: two upper chambers (atria) and two lower chambers (ventricles). These chambers are separated by valves to keep blood flowing in the proper direction. The right atrium and right ventricle receive oxygen-deprived blood from the body and pump it to the lungs to get oxygen.
