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4 giorni fa · 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.
4 giorni fa · 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.
- 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...
12 giu 2024 · At a glance: New study reveals that heart cells in zebrafish start beating suddenly and all at once to form a synchronized heartbeat. In developing zebrafish hearts, each cell can beat on its own, and unlike in an adult heart, the heartbeat isn’t coordinated by specialized pacemaker cells.
24 giu 2024 · You may be able to stop heart palpitations with a few simple lifestyle changes. Learn about 7 home remedies, as well as tips for keeping your heart healthy.
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15 ore fa · Cardiac arrest, also known as sudden cardiac arrest, is when the heart suddenly and unexpectedly stops beating. As a result, blood cannot properly circulate around the body and there is diminished blood flow to the brain and other organs. When the brain does not receive enough blood, this can cause a person to lose consciousness.
4 giorni fa · A myocardial infarction (MI), commonly known as a heart attack, occurs when blood flow decreases or stops in one of the coronary arteries of the heart, causing infarction (tissue death) to the heart muscle.
13 giu 2024 · Insufficient cardiovascular response to mental stress linked to reduced blood flow in the heart among people with heart disease. Imagine walking through a park and suddenly spotting a bear. Normally your heart starts beating faster and your blood vessels constrict.
