. Homoeopathic domestic physician [electronic resource]: containing the treatment of diseases; popular explanation of anatomy, physiology, hygiene and hydropathy; a treatise on domestic surgery, and an abridged materia medica. teries are numerous. The veins, which return the blood to the heart, are thinner,and more delicate in structure than the arteries. They arecomposed, like these, of the same three coats, but each one ismore delicate and fine. The capillaries form an extremely fine network of vessels,between the ends of the arterial and the beginning of thevenous system. Through these, all
. Homoeopathic domestic physician [electronic resource]: containing the treatment of diseases; popular explanation of anatomy, physiology, hygiene and hydropathy; a treatise on domestic surgery, and an abridged materia medica. teries are numerous. The veins, which return the blood to the heart, are thinner,and more delicate in structure than the arteries. They arecomposed, like these, of the same three coats, but each one ismore delicate and fine. The capillaries form an extremely fine network of vessels,between the ends of the arterial and the beginning of thevenous system. Through these, all the blood must pass ; andin this point, the capillary system resembles the fine ramifi-cations in the parenchyma of the lungs, where the bloodpasses through infinitely small vessels. The pulse is caused by the periodical action of the heart,projecting the blood in jets. In infants, it beats in a minutomore than a hundred times ; in adults, about seventy times ;in old persons, less than that, sometimes only sixty times. 580 ANATOMY AND PHYSIOLOGY. The quantity of blood in a healthy individual varies verymuch; fat persons have generally less. On an average, ahealthy adult has from twenty-five to thirty pounds. rice. Fig. 13. A front view of the organs within the chest and , 1, 1, 1, The muscles of the chest. 2, 2, 2, 2, The ribs. 3, 3, 3, Thejpper, middle, and lower lobes of the right lung. 4, 4, The lobes ofthe left lung. 5, The right ventricle of the heart. 6, The left ven-tricle. 7. The right auricle of the heart. 8, The left auricle. 9, The THE NERVOUS SYSTEM. 581 pulmonary artery. 10, The aorta. 11, The vena cava , The trachea. 13, The oesophagus. 14,14,14, 14, The pleura. 15,15, 15, The diaphragm. 16, 16, The right and left lobes of the , The gall-cyst. 18, The stomach. 26, The spleen. 19, 19, 20, The ascending colon. 21, The transverse colon. 25,The descending colon. 22, 22, 22, 22, The small intestines. 23, 23,The abdomina
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