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Beginning of Paper
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The Human Heart
The human heart is a specialized, four chambered muscle that
maintains blood flow in the circulatory system. The heart is located in the
thorax, it lies left of the body's midline, above and in contact with the
diaphragm. It is behind the breastbone, or sternum, and between the lungs,
with its apex tilted to ....
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Middle of Paper
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.... the heart muscles outside wall. Within
the sac, a small amount of fluid reduces the friction between the two
layers of tissue. In addition to, muscular and connective tissue, the heart
muscle contains varying amounts of fatty tissue, especially on the outside.
Both anatomically and functionally, the heart is divided in to a left and a
right half by the cardiac septum. Each half contains two separate spaces:
the atrium, or auricle, and the ventricle. The upper reservoirs, or
collecting chambers, are the thin-walled atria, and the lower pumping
....
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