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The heart is a muscular organ in most animals that pumps blood through the blood vessels of the cardiovascular system. Blood provides the body with chemical element and nutrients, similarly as assists within the removal of metabolic wastes. In humans, the heart is found between the lungs, within the middle compartment of the chest.
In humans, alternative mammals, and birds, the heart is split into four chambers: higher left and right atria; and lower left and right ventricles. Ordinarily the correct atrium and ventricle area unit referred along because the right heart and their left counterparts because the left heart. Fish, in distinction, have 2 chambers, associate degree atrium and a ventricle, whereas reptiles have 3 chambers. In a very healthy heart blood flows a way through the guts thanks to heart valves, that stop flow. The guts is encircled in a very protecting sac, the serosa, that conjointly contains little quantity of fluid. The wall of the guts is formed from 3 layers: visceral pericardium, myocardium, and serous membrane.
The heart pumps blood with a rhythm determined by a group of pace making cells within the SA node. These generate a current that causes contraction of the guts, traveling through the heart muscle and on the conductivity system of the guts.
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