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английский) 3:
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the human heart consists of four chambers: two atrial and two ventricles. blood travels in one direction only. this movement is due to the presence of blood in the heart valves. between предсердиями and your two ventricles are valves (in the left half of двустворчатый valve, in the right трёхстворчатый), they inhibit the reverse current of ventricular blood in the atria. the wall of the heart is composed of a striped heart muscle tissue, her work is regulated by the autonomic nervous system. ventricular wall is thicker than the atrial wall, because they're pushing the blood in the veins. highly developed wall of the left ventricle, because she shoves the blood on the large circle.
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