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The Circulatory System
Part 1 of Paper
....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 from the cells of the body back to the lungs for new oxygen. The left s.... Part 2 of Paper
....s by which the heart tissues themselves are supplied with nutrients and oxygen and are freed of wastes. Just beyond the semiluna valves, two coronary arteries branch from the aorta.
Heart action consists 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.... |
| Number of words: 521 - Approximate pages: 2 |
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