. The human body and health : an elementary text-book of essential anatomy, applied physiology and practical hygiene for schools . tral A^alve closed;p and r, veins from the lungs;ra, right auricle; rv, right ven-tricle; V, vena cava. Arrowsshow direction of circulation. lower are named ventricles (Fig. 74). The auricles are thin-walled sacs which receive the blood from all parts of thebody and pass it to the thick-walled ventricles, which send 116 THE CIRCULATOKY SYSTEM it out to the tissues. The cavities on the left side of theheart are known as the left auricle and left ventricle^ theother
. The human body and health : an elementary text-book of essential anatomy, applied physiology and practical hygiene for schools . tral A^alve closed;p and r, veins from the lungs;ra, right auricle; rv, right ven-tricle; V, vena cava. Arrowsshow direction of circulation. lower are named ventricles (Fig. 74). The auricles are thin-walled sacs which receive the blood from all parts of thebody and pass it to the thick-walled ventricles, which send 116 THE CIRCULATOKY SYSTEM it out to the tissues. The cavities on the left side of theheart are known as the left auricle and left ventricle^ theother two being termed the right auricle and right ven-tricle. The muscular walls of the left ventricle are morethan twice as thick as those of the right, because the one sends the blood allover the body, whilethe other sends itonly to the lungs. The two openingsinto the right auricleare the ascendingvena cava c^nd thedescending venacava. There is noopening betweenthe two auricles,but a large apertureguarded by valvespermits the bloodi to pass from anCalls heart cut open, a and ao, auriclc to the Ven-tricle below pulmonary. Fig. 77. arteries; c and o, parts of tricuspid valve;V, right ventricle; e, cut wall; n, cut wallheld up by a stick. veins open into the left auricle and bring the pure blood fromthe lungs. There is only one artery leading from each ven-tricle. From the left ventricle the aor^a,a great artery largerthan the thumb, carries the blood to the body. From theright ventricle the pulmonary artery extends to the Valves of the Heart. — In order that the blood maypass in only one direction through the heart, four sets of THE VALVES OF THE HEART 117
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