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11 de jun. 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.
- 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 2 días · Planifica con antelación. Es importante evitar hacer ejercicio, fumar y beber cafeína al menos 30 minutos antes de la lectura de la presión arterial. Todo eso aumenta temporalmente el ritmo cardiaco y la presión arterial. Fumar provoca la contracción de los vasos sanguíneos a corto plazo, y altera el flujo de sangre en el cuerpo.
11 de jun. de 2024 · The anatomy of the human heart starts with understanding each of the four chambers. Learn about the upper, lower, right, and left parts of heart anatomy.
4 de jun. de 2024 · An aging, more diverse population with rising cardiovascular risk factors – especially obesity and high blood pressure – will drive big increases in heart disease and stroke over the next 30 years, according to new projections.
15 de jun. de 2024 · The heart is a muscle that squeezes blood and functions like a pump. The heart's systems can be classified as either electrical or mechanical, and both of these systems are susceptible to failure or dysfunction.
18 de jun. de 2024 · A recent study found that a high heart score is linked to a lower biological age. The AHA recently added sleep to its list of essential heart health factors, making it Life’s Essential 8. Tackling just one of Life’s Essential 8 can positively impact the others.
4 de jun. de 2024 · About 61% of adults will have cardiovascular disease by 2050, new research from the American Heart Association predicts. The biggest driver of this trend will be the large number of people who...
