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The Circulatory System
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in anatomy and physiology is the course taken by
the blood through the arteries, capillaries, and veins and 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 t ....
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....flowing back into the auricle, and the
semilunar valves at the beginning of the aorta stop it from flowing back into
the ventricle. Similar valves are present in the pulmonary artery.
The aorta divides into a number of main branches, which in turn divide
into smaller ones until the entire body is supplied by an elaborately branching
series of bl.... |
| Word count: 1389 |
Page count: 6 |
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