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The heart is muscular organ pumps about 5-6 liters of blood per minute.The human heart is a muscular pump divided into 4 cameras. The upper two chambers kazyvaûtsâ Atria and the two lower ventricles.The two chambers of the heart serve different functions: Atrium collects blood coming into the heart and push it into the ventricles, ventricles and pushes the blood out of the heart into the arteries on which it enters into all parts of the body. To pump blood through the heart in his Chambers occur alternating relaxation (diastolic pressure) and reduction (systole), during which the Chamber filled with blood and pushed her, respectively. Heart valves act as Gates, giving blood to pass from one Chamber of the heart and of the heart Chambers to associated blood vessels. In the heart of the following valves: tricuspid, pulmonary, and aortic bicuspid. Krovenočnye blood vessels carry blood between the heart and various body tissues and organs. There are the following types of blood vessels: arteries, arterioles, capillaries, venules and veins. Arteries and arterioles carry blood from the heart. The veins and venules delivers blood back to the heart. Capillaries are the small blood where the exchange of oxygen and nutrients between the blood and the cells of various tissues. В организме взрослого человека находится в среднем 5 л крови. Кровь состоит из жидкой части и форменных элементов. Жидкая часть называется плазма, а форменные элементы состоят из эритроцитов, лейкоцитов и тромбоцитов. Плазма - это жидкость, в которой находятся клетки крови и тромбоциты.
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