. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . Pig. 193—Diagram to illustrate the relative proportions of the ^egate sectional we.; of the different parts of the vascular system (after \eo). A, aorta, C, , veins. 222 COMPARATIVE PHYSIOLOGY, THE ACTION OF THE MAMMALIAN HEART. What takes place may be thus very briefly stated : Theright auricle contracting- squeezes the blood through the au-ricular-ventricular opening into the right ventricle, never quite Superior VenaCava. Inferior VenaCava. Capillaries of theHead, etc. Pu
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . Pig. 193—Diagram to illustrate the relative proportions of the ^egate sectional we.; of the different parts of the vascular system (after \eo). A, aorta, C, , veins. 222 COMPARATIVE PHYSIOLOGY, THE ACTION OF THE MAMMALIAN HEART. What takes place may be thus very briefly stated : Theright auricle contracting- squeezes the blood through the au-ricular-ventricular opening into the right ventricle, never quite Superior VenaCava. Inferior VenaCava. Capillaries of theHead, etc. Pulmonary Capillaries ofTrunk andLower Ex-tremities. Fk;. 194.—Diagram of the circulation. The arrows indicate the course of the the pulmonary, the lower and the upper parts of the systemic circulationare represented so as to show the distinctness of each, it will be also apparent thatthey are not independent. Relative size of different parts of the system is onlyvery generally indicated. emptying itself probably; immediately after the right ventriclecontracts, by which its valves are brought into sudden tensionand opposition, thus preventing reflux into the auricle ; whilethe blood within it takes the path of least resistance, and the THE CIRCULATION OP THE BLOOD. 223 only one open to it into the pulmonary artery, and by itsbranches is conveyed to the capillaries of the lungs, from whichit is returned freed from much of its carbonic anhydride andreplenished with oxygen, to the left auricle, whence it proceedsin a similar manner into the great arterial main, the aorta, forgeneral
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