. Human and comparative anatomy, physiology, and hygiene . eceive blood from the body andfrom the lungs. The ventricles send blood to the bodyand lungs. (Figs. 28, 29, 39, 40.) Q. What is the use of the auricles? Of the ventricles ? 121. In the mammalia, as the horse, ox, &c, theheart has four cavities, two auricles, t\vo ventricles, andvalves, as in man. (Fig. 36.) Q. Describe the heart of the mammalia, as the horse. 52 ANATOMY, PHYSIOLOGY, AND HYGIENE. 122. In the amphibia and perfect reptiles, as the frogand snake, the heart has three cavities, two auricles, andone ventricle. One auricle re
. Human and comparative anatomy, physiology, and hygiene . eceive blood from the body andfrom the lungs. The ventricles send blood to the bodyand lungs. (Figs. 28, 29, 39, 40.) Q. What is the use of the auricles? Of the ventricles ? 121. In the mammalia, as the horse, ox, &c, theheart has four cavities, two auricles, t\vo ventricles, andvalves, as in man. (Fig. 36.) Q. Describe the heart of the mammalia, as the horse. 52 ANATOMY, PHYSIOLOGY, AND HYGIENE. 122. In the amphibia and perfect reptiles, as the frogand snake, the heart has three cavities, two auricles, andone ventricle. One auricle receives blood from the sys-tem, the other from the lungs. The ventricle sendsblood both to the system and the lungs. (Figs. 37, 41.) Q. Describe the circulation of frogs and snakes. 123. Fishes have a distinct heart, with but one au-ricle and one ventricle. The auricle receives blood fromthe body. The ventricle sends it to the gills. Fromthe gills it is carried to the body. (Figs. 38, 45.) Q. Describe the circulation of fishes? Fig. 37. Fig. 33. v Fig. 37. Ideal plan of the heart of a frog. 1. The pericardium, (heartcase.) 2. The single ventricle. 3. The auricle that receives blood fromthe lungs. 4. The auricle that receives blood from the body. Thoarrows show the direction of the blood. Fig. 33. Ideal plan of the heart of the fish. 1. The The ventricle that receives blood from the body. 3. The ventriclethat sends blood to the gills. 121. Insects have no heart; but they have a centralpulsating vessel. Q. Describe the circulation of insects. 125. The size of the heart varies in different weighs about eight and a half ounces. Each cavityin an adult holds about half a gill of blood. Q. What is the size of the heart ? SYSTEMIC CIRCULATION. 53 126. Between the cavities of each side of the heartthere are thin membranes called valves. Those in theright side are called tri-cuspid valves; those in theleft side, mitral valves. These valves allow the bloodto
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