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The Circulatory System
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Circulatory System in anatomy and physiology. The course taken by the blood through the arteries, capillaries, and veins back to the heart. In humans and the higher vertebrates, the heart is made up of four chambers. The right and left auricles, or atria, and the right and left ventricles. The right side of the heart pumps oxygen poor blood fr ....
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....onsists of systole and relaxation of the muscular walls of the atria and ventricles. During the period of relaxation, the blood flows from the veins into the two atria. This action is sudden and occurs almost simultaneously in both atria. The mass of blood in the veins makes it impossible for any blood to flow backward. The ventricular systole .... |
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Page count: 2 |
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