In ancient times the Greeks considered that heart is a receptacle of spirit, the Chinese believed that there lives happiness, Egyptians believed that in it the intelligence and emotions arise. How does this unique body ensuring functioning of all organism work?
Heart consists of four departments, or cameras. In the top part auricles are located: right and left, and in lower - ventricles, also right and left. At the same time they are not reported among themselves. On the surface of heart the set of the branching fibers which generate is located and transfer electric impulses. These impulses or as they are called still by ""signals"", arise in sinus node on a surface of the right auricle. From there the impulse passes through an auricle, reduces it and goes down a ventricle, also synchronously reducing gastric muscle fibers. Thus, reduction happens wavy. During reduction of cardiac muscles from the right auricle blue blood is pushed out and goes to the right ventricle which, in turn, pushes out it on a small circle of blood circulation – in network of pulmonary vessels. There from blood carbon dioxide is emitted, and oxygen comes to blood from air, that is there is a gas exchange. After that the blood enriched with oxygen comes to the left auricle, and from it - to the left ventricle. Then through an aorta it is pushed out on a big circle of blood circulation on all organism. During relaxation of cardiac muscles in an organism the new portion of blood acts this way. Thanks to such electric system the heart "fights" and there is a blood exchange. For one blow the heart pushes out about 100 cubic centimeters of blood that makes 10000 liters a day. Per day about 100 thousand blows of heart are necessary and as much it has a rest between blows. In general, during the day heart has a rest 6 hours. Normal rate of reductions at the healthy person in a quiet state about 60-80 in a minute.