Anatomy, physiology and hygiene . and the organs through which it is pro-pelled are the organs of circulation. These organs are theheart and the blood-vessels, the latter consisting of thearteries, capillaries, and veins. There is in reality onlyone circulation, but the heart sends out two streams ofblood : one to the lungs, which returns again to the heart,sometimes called the pulmonary, respiratory, or lesser, circu-lation ; the other through the rest of the body and backto the heart, called the systemic, or greater, circulation. 147. The Heart is a hollow, muscular, conical-shapedorgan, in
Anatomy, physiology and hygiene . and the organs through which it is pro-pelled are the organs of circulation. These organs are theheart and the blood-vessels, the latter consisting of thearteries, capillaries, and veins. There is in reality onlyone circulation, but the heart sends out two streams ofblood : one to the lungs, which returns again to the heart,sometimes called the pulmonary, respiratory, or lesser, circu-lation ; the other through the rest of the body and backto the heart, called the systemic, or greater, circulation. 147. The Heart is a hollow, muscular, conical-shapedorgan, in adults about five inches long. It is situatedobliquely in the chest, between the two lungs, and behindthe lower two-thirds of the breast bone, its posterior por-tion in part resting upon the diaphragm. It is chiefly onthe left side of the body. Its tip, or apex, is directedforward and downward, striking against the walls of thethorax, between the fifth and sixth ribs, a little to the left 143 144 THE — Fig. View of the Organs of Circulation. - Veins, black ; arteries, with transverselines Parts on the right side of figure are removed to show some of the deepvessels, while the left side shows superficial vessels. THE CIRCULATION. —BLOOD. —LYMPH. 145 of the breast bone, at which point we can usually bestfeel the impulse of the organ. Its broad attached end,
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