A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . hes;but unlike the lat-ter, it also passestwice through theheart. The simplevenous heart ofthe fish is replacedby a double organwit h a right venousside which trans-fers the blood fromthe systemic veinsto the pulmonaryartery; and a leftarterial side, whichreturns it againfrom the pulmo-nary veins to theaorta. A third setof capillaries maybe interpolated inthe course of asingle circuit. Theblood which is dis-tributed to the ab-dominal ^Tscera iscollected by the port
A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . hes;but unlike the lat-ter, it also passestwice through theheart. The simplevenous heart ofthe fish is replacedby a double organwit h a right venousside which trans-fers the blood fromthe systemic veinsto the pulmonaryartery; and a leftarterial side, whichreturns it againfrom the pulmo-nary veins to theaorta. A third setof capillaries maybe interpolated inthe course of asingle circuit. Theblood which is dis-tributed to the ab-dominal ^Tscera iscollected by the portal vein and must pass through thecapillaries of the liver before returning to the terms greater or systemic circulation, lesseror pulmonary circulation and portal circulationare commonly used to designate the several subdivi-sions of the complete path taken by the blood. The fact of the circulation of the blood in manwas first established by William Har\-ey in 1016and his great discovery, aside from the paramountsignificance of the fact, marks an epoch in the historyof medicine in that it was the first example of a. Fig. 706.—Circulatorj Organs of theFrog. P, Left lung—right lung is re-moved: Ap, pulmonary- arterj T*p, pul-monary vein: Vc, vena cava inferior: Ao,dorsal aorta: X, kidney: D, alimentarycanal: Lk, portal circulation. REFERENCE HANDBOOK OF THE MEDICAL SCIENCES Blood, Circulation or physiological discovery proved by exact experimentalmethods. Until the middle of the fifteenth centurythe Galenic teachings were accepted without main features of his physiology so far as theheart and circulation are concerned may be briellystated as follows: The food absorbed from thealimentary canal is carried by the portal vein tothe liver and there converted into blood with certainnutritive properties summed up in the term NaturalSpirits. But this crude blood is unfitted for thehigher purposes of the blood in the body. Carriedfrom the liver to the right side
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Keywords: ., bookauthorbuckalbe, bookcentury1900, bookdecade1910, bookyear1913
