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Beginning of Paper
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The Circulatory System
The circulatory system 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- ....
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Middle of Paper
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.... 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 of still
more minute vessels, the capillaries, which have extremely thin walls; thus,
the blood is enabled to come into close relation with the fluids and
tissues of the body. In the capillaries, the blood performs three functions
then it releases its oxygen to ....
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SUBJECTS
