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16 mag 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...
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.
- Left and Right Sides
- Diastole, Systole, and Blood Pressure
- Gas Exchange
- Pulse
The left and right sides of the heart work in unison. The atria and ventricles contract and relax in turn, producing a rhythmic heartbeat. Right side The right side of the heart receives deoxygenated blood and sends it to the lungs. 1. The right atrium receives deoxygenated blood from the body through veins called the superior and inferior vena cav...
Each heartbeat has two parts: Diastole:The ventricles relax and fill with blood as the atria contract, emptying all blood into the ventricles. Systole:The ventricles contract and pump blood out of the heart as the atria relax, filling with blood again. When a person takes their blood pressure, the machine will give a high and a low numberTrusted So...
When blood travels through the pulmonary artery to the lungs, it passes through tiny capillaries that connect on the surface of the lung’s air sacs, called the alveoli. The body’s cells need oxygen to function, and they produce carbon dioxide as a waste product. The heart enables the body to eliminate the unwanted carbon dioxide. Oxygen enters the ...
A person can feel their pulse at points where arteries pass close to the skin’s surface, such as on the wrist or neck. The pulse is the same as the heart rate. When you feel your pulse, you feel the rush of blood as the heart pumps it through the body. A healthy pulse is usually 60–100 bpmTrusted Source, and what is normal can vary from person to p...
The heart has the shape of a pyramid, with its apex pointing towards the left nipple while its base forms the posterior surface of the heart. Other surfaces are the anterior, inferior (or diaphragmatic), and two pulmonary surfaces facing the lungs.
Sentiamo di poter fare meglio e riteniamo di poter fare la differenza addestrando migliaia di persone sul supporto vitale di base, avanzato e pediatrico con la qualità e il rigore dei corsi dell’American Heart Association.
3 nov 2023 · Heart (right lateral view) The heart is a muscular organ that pumps blood around the body by circulating it through the circulatory/vascular system. It is found in the middle mediastinum, wrapped in a two-layered serous sac called the pericardium.
6 giu 2014 · Do you want to learn more about the anatomy and function of the human heart? Watch this 3D medical animation that shows how the heart pumps blood throughout the body and what happens when it is ...
- 1 min
- 618K
- Nucleus Medical Media
