The outlines of anatomy, physiology, and hygiene Being an edition of The essentials of anatomy, physiology, and hygiene, rev to conform to the legislation making the effects of alcohol and other narcotics upon the human system a mandatory study in public schools . Ftg. 43.—Illustrating the action of the valves in the right side of the heart:. 154 ORGANS OF REPAIR. too far back. In other words, to fulfill their object,these cords must be able to become longer or short-. FiG. 44.—Illustrating the action of the valves in the right side of the heart. er according to circumstances. This is effected
The outlines of anatomy, physiology, and hygiene Being an edition of The essentials of anatomy, physiology, and hygiene, rev to conform to the legislation making the effects of alcohol and other narcotics upon the human system a mandatory study in public schools . Ftg. 43.—Illustrating the action of the valves in the right side of the heart:. 154 ORGANS OF REPAIR. too far back. In other words, to fulfill their object,these cords must be able to become longer or short-. FiG. 44.—Illustrating the action of the valves in the right side of the heart. er according to circumstances. This is effected bysmall muscular projections or pillars, which extendfrom the walls of each ventricle into its interior, andto which the cords are attached. When the heartcontracts, these little pillars contract at the sametime, and make the cords attached to the valvesshorter and shorter as the contraction proceeds, justin proportion as the cavity of the ventricle growssmaller and smaller. In this way the reflux of bloodthrough these large valves is prevented (Figs. 43, 44). 199. The Contraction of the Heart.—The con-traction of the heart does not run successively fromone auricle to the corresponding ventricle, and thenfrom the other auricle to the other ventricle, but thecontraction of both sides of the heart is simultane- THE HEART. \tt 3D ous« It beirins at the auricles and extends down-ward until the ventricles are both firm and hard andreduced to their smallest pos
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