. A healthy body. A textbook on anatomy, physiology, hygiene, alcohol, and narcotics. For use in intermediate grades in public and private schools . chest withthe lungs. By reference to Fig. 29, it will be seenthat the heart and lungs nearly fill the thoracic cavity,and that they are separated from the organs in theabdomen by the thin wall of muscle called the dia-phragm. The heart is enclosed in a sac, the lowerpart of which rests on this diaphragm. The Position of the Heart. The heart is not all on theleft side. The rule is that if we draw a line downthe middle of the breast-bone, as shown i
. A healthy body. A textbook on anatomy, physiology, hygiene, alcohol, and narcotics. For use in intermediate grades in public and private schools . chest withthe lungs. By reference to Fig. 29, it will be seenthat the heart and lungs nearly fill the thoracic cavity,and that they are separated from the organs in theabdomen by the thin wall of muscle called the dia-phragm. The heart is enclosed in a sac, the lowerpart of which rests on this diaphragm. The Position of the Heart. The heart is not all on theleft side. The rule is that if we draw a line downthe middle of the breast-bone, as shown in Fig. 34,the heart will extend about three inches to the leftof the line, and one and a half inches to the base, or larger part, is up as high as the thirdrib, and more of the base is on the right side than on 8 114 A HEALTHY BODY. the left. The poiiit of the heart extends well over the left side : it is therewe can feel it illustration showsthat this point is be-tween the fifth andsixth ribs, and that theheart is placed oblique-ly in the chest. The Cavities in theHeart. The heart is di- FiG. 34. The position of the vided lengthwise, by afirm wall, into two parts,so that there is no con-nection whatever be-tween the two left side alwayscontains arterial blood,and the right side ven-ous blood. By referenceto Pig. 35 it will be seenthat the parts 8 and 4together represent theright side, while the parts6 and 7 together repre-sent the left side. Thewall between the two
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