An academic physiology and hygiene .. . d, cartilages, andtendons, have also lymphatic vessels mingling with theblood vessels. In their course the lymph vessels form insome parts of the body, as about the neck, groins, and arm-pits, numerous small, solid bodies called lymphatic twining about through the tissues and amidstglands, the lymphatics pour their contents into the tho-racic duct which empties its liquid into the great veinat the left side of the heart, from which it is sent tothe lungs to be purified before entering the general circula-tion. CHAPTER X. THE CIRCULATION. 1.
An academic physiology and hygiene .. . d, cartilages, andtendons, have also lymphatic vessels mingling with theblood vessels. In their course the lymph vessels form insome parts of the body, as about the neck, groins, and arm-pits, numerous small, solid bodies called lymphatic twining about through the tissues and amidstglands, the lymphatics pour their contents into the tho-racic duct which empties its liquid into the great veinat the left side of the heart, from which it is sent tothe lungs to be purified before entering the general circula-tion. CHAPTER X. THE CIRCULATION. 1. The Circulatory Apparatus. — For the purpose of con-veying throughout the body the blood, the circulation ofwhich is essential to growth, and by which fresh materialis deposited in place of that which has worn out or becomeunfit for use, there is in the body a circulating apparatus THE BLOOD AND ITS CIRCULATION. 8l analogous to that by which cities arc supplied with water. 2. A powerful and complex machine, the heart, receives 9L~ /?. Fig. 30. The Heart and large Blood Vessels. EXPLANATION. q> the deseet o, th n. the right auricle. l>. th Iricle. k. the pulmonary artery. /, /, the right and left branches of thisartery, going to the lungs on either side ofthe ci -1ins of th e /;/ngs. which re111 rn what the artery sent in, to r, the left auricle,a. the left ventricle. great artery of theb.»dy. rising out of the left heart. .C tl /;. the left commup the ^id<- of the no k to the head. i, thi to the left arm. — The arrows show tl the blood d h of the vessels demon- strated with the heart: n, the right auricle ; m, w, veins f the lungs ; s. the left coronaryartery ; /, the veins returning blond from the liver and bow the blood into its 5, and, actin forcing-pump, ?pels it into an extensive series of tubes, the arteries, 82 ACADEMIC PHYSIOLOGY. by which it is conveyed to all parts of the body to give itnourishment. A network of very fine tubes, the capilla-ries, various
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