Identifier: anatomyphysiolo00hewe (find matches)
Title: Anatomy, physiology and hygiene for high schools
Year: 1900 (1900s)
Authors: Hewes, Henry Fox, 1867-
Subjects: Physiology Health education (Secondary) Human anatomy
Publisher: New York : American Book Company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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ow of blood intothe ventricle is prevented. The blood is forced along thepulmonary artery to the capil-laries of the lungs by the forceof the beat of the ventricles, andfrom these capillaries into thepulmonary veins, and so back tothe left auricle of the heart. At the same time that the rightauricle is contracting upon theblood of the general circulationwhich it has received, the leftauricle is contracting upon theblood which it has received, asabove described, from the lungsby the pulmonary veins. Thisblood it forces into the left ven-tricle. The left ventricle con-tracts at the same time with theriglit, and presses the blood x)astthe semihmar valves into the aorta, and thus into the gen-eral circulation. The pressure of the blood upon the mitralvalve closes it, and prevents regurgitation of the blood intothe auricle. When the ventricle dilates again, the semilunarvalve of the aorta prevents reflux of the blood to the ventricle.The impulse of the left ventricle forces the blood aloug
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Diagram of the circulatorysystem. J7, heart; L, kings; i, intestine;F, liver; K, kidneys; 6, aorta; b. &x-teiles to head and Tipper extremities;h. arteries to tinink and lower ex-tremities; c, v-enae cavjB; c, veinsfrom upper extremities; c, veinsfrom lower extremities; d. pulmo-nary aitery; e, pulmonary veins;/. portal circulation; g, renal circu-lation. CIRCULATION AND THE CIRCULATORY SYSTEM 161 the aorta to the arteries and capillaries throughout the body.From the capillaries it is returned by the veins to the rightauricle, thence as described to the right ventricle, lungs, andleft auricle, and into the ventricle again. Thus by the im-pulse of the heart the blood is kept flowing in a big circularcourse over the body. Work of the heart. The heart beats seventy times a min-ute. At each beat each ventricle forces six ounces of bloodalong against the back pressure of the blood in the vessels.When all this work is calculated, it will be found that theheart in one day does work equal

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