Identifier: elementsofanimal00ange (find matches)
Title: Elements of animal physiology, chiefly human
Year: 1873 (1870s)
Authors: Angell, John
Subjects: Physiology Anatomy Physiology Anatomy
Publisher: New York : Putnam
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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lungs. . 4, It is poured hach (oxidized and purified) by the four pulmonaryveins into the left auricle. 5. Tlie left auricle now contracts, and drives the blood throughthe left auricidOVentricular opening (the mitral valve being open)into the left ventricle. 6. The left ventricle now contracts, the mitral valve simul-taneously closing, while the aortic valve opens, and drives theblood through the aorta into the general system. 192. Experimental Proof of the Course of the Bloodthrough the Heart,—Procure a sheeps heart, havinginstructed the butcher not to cut off the blood-vesselswithin a few inches of the heart itself. Tie up one ofthe venc^ cavce—insert a glass tube into the other—inject water into theheart throughthe tube, itwill flow outof the pulmon-ary arteriesand will notreach the leftside of theheart. Repeat theexperiment byinjecting wa-ter throughone of thepuUmonari/ veins(the other be-ing tied), thewater will flowout of theaorta, and notthrough theright side ofthe heart.
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Fisf. 44. Diagram of the Circulation through theHeart (after Dalton.) VALVES OP THE HEART, 95 If the tops of the ventricles be cut off and the ven-tricles filled with water, the aorta and pulmonaryveins being tied, the thin membranous valves will bepressed upwards, becoming tightly stretched, and thewhole action of the valves clearly visible. 193. Valves of the Heart (from Lat. valvce, foldingdoors).—The valves are tough, flexible, membranousstructures, which are attached to the fibrous borders ofthe openings into the heart, and hetween its upper andlower chambers. (See figs. 43 to 45.) They are so arranged as only to permit of the passage offluid in one direction, any attempt at reflux causing theblood to get behind the flaps or segments of the valves,and thus force them tightly against the openings, so asto close them the more efiectually in proportion as thebackward pressure is increased. But for the chordce Aortio Valve. Tdg\\i Coronary / Artery.

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