An academic physiology and hygiene .. . 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 als
An academic physiology and hygiene .. . 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. Iu3 RAV Fig. 32. The Orifices of the Heart seen from above, the Auricles and Great Vesselsbeing cut away. EXPLANATION. P. A, pulmonary artery, and Ao, aorta, with their semilunar valves. R. A. !r., right ? do-ventricular orifice, showing the three folds (/v, 1, 2, 3) of the tricuspid valve. L. A. I., left auriculo-vcntriadar orijice, showing its mitral valve of IWO flaps at ;//. v., 1 and 2. A piece of whalebone at b passes into the coronary vein. The tooth-like appeafiUM * the left side of L. A. I, is due to the fact that the section of the auricle is carried through -een on the exterior surface of the heart. 11. In a healthy condition of the heart, all of thesevalves work harmoniously and perfectly; but in certain _ mic dis they become deranged, thus leading to and often fatal results. 12. Course of the Blood in Circulation. — The minute veinsin all parts of the body collect the impure blood. Thveinlets unite and form larger branches which finally oil- 86 ACADEMIC PHYSIOLOGY. mi
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