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Your heart’s main function is to move blood throughout your body. Blood brings oxygen and nutrients to your cells. It also takes away carbon dioxide and other waste so other organs can dispose of them. Your heart also: Controls the rhythm and speed of your heart rate. Maintains your blood pressure.
Jun 11, 2024 · Summary. The heart is the pump that moves blood around your body. It has four main parts: two upper chambers called atria and two lower chambers called ventricles. These parts work together to get oxygen-rich blood to your body and oxygen-poor blood back to your heart.
Oct 31, 2024 · The right atrium receives venous blood from the head, chest, and arms via the large vein called the superior vena cava and receives blood from the abdomen, pelvic region, and legs via the inferior vena cava.
- 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...
Sep 30, 2020 · The atria: These are the two upper chambers, which receive blood. The ventricles: These are the two lower chambers, which discharge blood. A wall of tissue called the septum separates the left...
Mar 24, 2022 · Heart chambers. The two upper chambers of your heart are called atrium , and the two lower chambers are called ventricles . Blood flows from the body and lungs to the atria and from the atria to the ventricles. The ventricles pump blood out of the heart to the lungs and other parts of the body.
The heart muscle consists of walls, chambers, valves, blood vessels and an electrical conduction system. The entire heart is surrounded by a protective sac called the pericardium that produces fluid to lubricate the heart and protect it from rubbing against other organs.
Your blood flows through your heart and your lungs to pick up oxygen before being pumped to the rest of your body. Oxygen is added to your blood in four main steps: the right atrium receives blood low in oxygen from the rest of the body.
