File: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 (14780421781).jpg

Identifier: outlinesofanatom00trac (find matches)
Title: 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
Year: 1889 (1880s)
Authors: Tracy, Roger Sherman, 1841-1926
Subjects: Human anatomy Physiology Hygiene Anatomy Physiology Hygiene
Publisher: New York, American Book Co
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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Auricles and Ventricles.—Each side ofthe heart is divided into two cavities, making fourin the whole organ. These cavities are called the THE HEART. 149 auricles and ventricles. The ventricles constitute thegreater part of the heart, and it is in their walls thatthe greatest muscular power is located. The auri-cles are smaller cavities, situated at the upper ex-tremity of the organ, and their walls are muchthinner and weaker than the walls of the ventricles.The blood passes from the veins into the auricles,from the auricles into the ventricles, and from theventricles it is forced out into the body. The courseof the blood, then, is from the bodv in sreneralthrough the veins to the right auricle; frojn the rightauricle to the righi ventricle ; from the right ventricle to the lungs; from thelungs to the left auri-cle ; from the left au-ricle to the left ventri-cle ; from the left ven-tricle out to the bodyin general, whence itis collected by theveins and broughtback to the right au-the
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to begin agam ricle, same course (Fig. 42). 195. The Valvesof the Heart.— Atthe mouths of theveins, where theyemptv into the au-ricles, there are novalves, and they are not really needed at this point,for the auricles do not contract with much force,and as there is always a current in the veins running11 Fig. 42.—Diagram illustrating the courseof the blood through the heart. I50 ORGANS OF REPAIR. toward the heart, and as the ventricles lie below theauricles, the blood naturally flows into the ventri-cles, where it meets with no resistance, rather thanbackward, where it would meet with considerable,having to oppose the force of gravity and alsothe current in the veins. In this manner the ven=tricles become filled with blood, and, when theybegin to contract, the case is very different. Herethere is an enormous pressure to overcome. Theright ventricle must contract with force sufficientto send its contents into the lungs, pushing be-fore it the column of blood already in the ves-sels

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