The heart is a very importent for human body. boot as assists at intervals the removal of metabolic wastes.[2] In humans, the middle is found between the lungs, at intervals the center compartment of the chest.[3]
In humans, various mammals, and birds, the middle is split into four chambers: higher left and right atria; and lower left and right ventricles.[4][5] usually the right atrium and ventricle unit of measurement referred on as a result of the proper heart and their left counterparts as a result of the left heart.[6] Fish, in distinction, have a pair of chambers, degree atrium and a ventricle, whereas reptiles have three chambers.[5] in associate extremely healthy heart blood flows a way through the middle because of heart valves, that stop flow.[3] the middle is enclosed in associate extremely protective sac, the serosa, that collectively contains alittle amount of fluid. The wall of the middle is created from three layers: serous membrane, myocardium, and serosa.[7]
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