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The Circulatory System
Beginning of paper
is the course taken by the blood through the
arteries, capillaries, and veins and back to the heart. In humans, 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 si ....
Middle of paper
....he 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 blood vessels. The smallest arteries divide into a fine network o.... |
| Word count: 1335 |
Page count: 5 |
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