An academic physiology and hygiene .. . in which there is no opening, theauricles and ventricles are not so separated. They areso arranged as to allow the blood to pass freely from eachauricle to each ventricle (but not from the ventricle tothe auricle) by means of little doors or valves composedof strong fibrous tissue prolonged into cords which areattached to the walls of the heart. These openings areknown as the auriculo-voitricular openings. The valvebetween the right auricle and right ventricle is commonlyknown as the tricuspid (, three-pointed) valve, it havingthree leaflets ; that b
An academic physiology and hygiene .. . in which there is no opening, theauricles and ventricles are not so separated. They areso arranged as to allow the blood to pass freely from eachauricle to each ventricle (but not from the ventricle tothe auricle) by means of little doors or valves composedof strong fibrous tissue prolonged into cords which areattached to the walls of the heart. These openings areknown as the auriculo-voitricular openings. The valvebetween the right auricle and right ventricle is commonlyknown as the tricuspid (, three-pointed) valve, it havingthree leaflets ; that between the left auricle and left ven-tricle, the mitral valve, having two leaflets which, whenopen, arc supposed to resemble a mitre. 9. The muscular walls of the left side of the heart arethicker and stronger than those of the right side, since 84 ACADEMIC PHYSIOLOGY. more force is required to drive the blood through thearteries than merely to receive it back from the veins andpropel it to the lungs, as is done by the right side. This. Fig. 31. Interior of the Right Side of the Human Heart. EXPLANATION. i, superior vena cava ; 2, inferior vena cava ; 3, interior of the right auricle ; 4, semi-lunar valves of the pulmonary artery ; a?, papillary muscle ; 5, 5, and 5, cusps of the tri-cuspid valve ; 6,pulmonary artery ; 7, 8, and 9, the aorta and its branches ; 10, left auricle;11, left ventricle. is especially true of the left ventricle, whose work it is topropel the blood through the whole system. THE BLOOD AND ITS CIRCULATION. 85 10. Besides the valves already mentioned, there are also valves in the aorta (the main trunk of the arterial system),and in the pulmonary artery (the artery conveying bloodto the lungs). nw2
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