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16 de may. de 2024 · 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 that is the center of the circulatory system in humans, other mammals, and birds. Learn more about the heart in this article.
- 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...
Hace 1 día · The heart is a muscular organ found in most animals. This organ pumps blood through the blood vessels of the circulatory system. The pumped blood carries oxygen and nutrients to the body, while carrying metabolic waste such as carbon dioxide to the lungs.
15 de may. de 2024 · Several health conditions, your lifestyle, and your age and family history can increase your risk for heart disease. These are called risk factors. About half of all Americans (47%) have at least 1 of 3 key risk factors for heart disease: High blood pressure 1. High cholesterol 1. Smoking 1.
Hace 3 días · The circulatory system includes the heart, blood vessels, and blood. [2] The cardiovascular system in all vertebrates, consists of the heart and blood vessels. The circulatory system is further divided into two major circuits – a pulmonary circulation, and a systemic circulation.
15 de may. de 2024 · You can choose healthy habits to help prevent heart disease. Choose healthy food and drinks. Choose healthy meals and snacks to help prevent heart disease and its complications. Be sure to eat plenty of fresh fruits and vegetables and fewer processed foods. Eating lots of foods high in saturated fat and trans fat may contribute to ...
15 de may. de 2024 · Heart disease is the leading cause of death for men, women, and people of most racial and ethnic groups. 1. One person dies every 33 seconds from cardiovascular disease. 1. About 695,000 people died from heart disease in 2021—that's 1 in every 5 deaths. 1 2.
15 de may. de 2024 · Many people have warning symptoms that happen hours, days or weeks in advance. For example, chest pain or pressure that keeps happening and doesn't go away with rest may be an early warning sign of a heart attack. Never ignore heart attack symptoms, even if they don't seem serious.
