Anatomy, physiology and hygiene for high schools . a partition or septum, is the right the right wall of this auricle is the opening of the twolarge veins which col-lect the blood return-ing from the tissuesto the heart, the stqje-rior and inferior venacava (hollow). In the lower anteri-or part of the auricleis the opening of theright ventricle. Thisis covered by a three-flap valve, the tricus-pid (Latin tri^ three,and cuspis, spearpoint) valve. It pre-vents regurgitation(Latin re, * again,and gurgitare, to en-gulf) of the bloodfrom ventricle toauricle. The right ventriclelies in th
Anatomy, physiology and hygiene for high schools . a partition or septum, is the right the right wall of this auricle is the opening of the twolarge veins which col-lect the blood return-ing from the tissuesto the heart, the stqje-rior and inferior venacava (hollow). In the lower anteri-or part of the auricleis the opening of theright ventricle. Thisis covered by a three-flap valve, the tricus-pid (Latin tri^ three,and cuspis, spearpoint) valve. It pre-vents regurgitation(Latin re, * again,and gurgitare, to en-gulf) of the bloodfrom ventricle toauricle. The right ventriclelies in the lower partof the heart, to the right. It is separated from the left ventricle by a walls of this ventricle are thicker and firmer than thoseof the auricle, but less thick than those of the left ven-tricle. At the top of the ventricle, toward the front, is theopening to the pulmonary artery. This opening is coveredby a set of seniilimar valves similar to those of the Interior of heart, showing right auricleand ventricle and valves. rt, auricle; c, semilunar valve; i, inferior venacava; p, pulmonary artery: s, superior vena cava;t, tricuspid valve; v, ventricle. 158 PHYSIOLOGY AND HYGIENE
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