The heart may be a muscular organ in most animals, that pumps blood through the blood vessels of the vascular system. Blood provides the body with elements and nutrients, further as helping within the removal of metabolic wastes. In humans, the center is found between the lungs, within the middle compartment of the chest. In humans, different mammals, and birds, the center is split into four chambers: higher left and right atria and lower left and right ventricles. ordinarily, the proper atrium and ventricle are referred along because of the right heart and their left counterparts because of the left heart. Fish, in distinction, has 2 chambers, Associate in Nursing atrium and a ventricle, whereas reptiles have 3 chambers. in very healthy heart blood flows a method through the center thanks to heart valves, that stop backflowing. the center is encircled in a very protecting sac, the serous membrane, that conjointly contains little quantity of fluid. The wall of the center is created from 3 layers: serous membrane, myocardium, and serosa.
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