MORRIS H. KAHN, A.M., M.D.
The functional capacity of the heart is a subject of importance from the purely physiological standpoint. Originally, a short contractile tube as in the perivisceral cavity of an ascidian, it is neither structurally nor functionally much entangled with the creature's other organs. But in higher types in which this simple tube is replaced by closed arterial and venous systems ramifying in every organ, we find that the circulatory apparatus has become structurally interwoven with the whole body. And it has become unable properly to fulfill its office without the help of offices that are quite separated from its own,
KAHN MH. The Influence of Venous Filling on the Heart. Ann Intern Med. ;3:969–990. doi: 10.7326/0003-4819-3-10-969
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Published: Ann Intern Med. 1930;3(10):969-990.
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