. Human physiology : designed for colleges and the higher classes in schools, and for general reading. and down alternately. These are connected with a pipe, c, /,in which there are two valves, d and e, opening in the directionof the arrows. The portion c of the pipe represents the venoustrunk discharging its blood into the heart, and the portion /,the artery which is the outlet for the blood. The pump, a,represents the auricle, and the pump, b, the ventricle. Whenthe piston in a is raised, the fluid enters through c to fill it bysuction, as it is termed. When, now, its piston is lowered, thef
. Human physiology : designed for colleges and the higher classes in schools, and for general reading. and down alternately. These are connected with a pipe, c, /,in which there are two valves, d and e, opening in the directionof the arrows. The portion c of the pipe represents the venoustrunk discharging its blood into the heart, and the portion /,the artery which is the outlet for the blood. The pump, a,represents the auricle, and the pump, b, the ventricle. Whenthe piston in a is raised, the fluid enters through c to fill it bysuction, as it is termed. When, now, its piston is lowered, thefluid is forced through the valve d into the pump b, (which re-presents the ventricle,) whose piston is aUihe same time raisedto receive it. And when the piston in b is lowered in its turn, * This dilatation is an active one, as was stated in § 106, when speaking of the heartas a whole. The ventricle docs not dilate because the blood is forced into it, but theblood rushes into it because it dilates. 76 HUMAN PHYSIOLOGY Ventricles larger and stronger than the auricles. Valves of the aorta. FIG. the fluid being prevented from returning into a, by the closureof the valve d, is forced through the valve e into /, representingthe discharging tube, the artery. At the same time, a freshsupply of fluid is received into a by the raising of its piston. 119. I have described the auricle and ventricle of one sideof the heart, the right side. The left side is constructed verymuch in the same way. You will observe, in Fig. 26, that theventricle is much more capacious than the auricle. The auricleis indeed the antechamber to the ventricle. The ventricle,too, you see, is much thicker in its walls. It is made verystrong, because it does by far the principal part of the remark here, in passing, that the size of the whole heart isabout that of the closed hand of the individual. 120. I will now call your attention to a more particular viewof the valves of the heart. We will take, first,
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