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The Circulatory System
Part 1 of Paper
....t. 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 side of the heart receives blood rich in oxygen from the
lungs and pumps.... Part 2 of Paper
....is forced into the left ventricle and then by
ventricular contraction into the aorta. The bicuspid, or mitral valve
prevents the blood from 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 blood vessels. .... |
| Number of words: 1335 - Approximate pages: 5 |
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