The Course of Blood in the Heart

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Diagram of the rush of blood when the heart beats. The valves (v) open above are closed below while the valves (s) closed above are open below.


Davison, Alvin Human Body and Health: An Intermediate Textbook of Essential Physiology, Applied Hygiene, and Practical Sanitation for Schools (New York: American Book Company, 1909) 88


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