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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; t .... Middle of paper
.... by the four pulmonary veins, which enter the left auricle. When this
chamber contracts, blood 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 n ....
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Number of words: 1335
Number of pages: 5 (approx. 250 words per double-spaced page)
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