. A text-book of physiology : for medical students and physicians . Fig. 232.—Diagram of the normal volume curve (plethysmogram) of the dogs heartwhen beating at a slow rate (after Hirschf elder). The up-stroke represents the systole,the down-stroke the diastole; 4 to 5 the period of diastasis {Henderson). At 5 the auricularcontraction causes a slight additional dilatation of the ventricle. 1,2, and 3 represent thetime of occurrence of the first, second, and third heart-sounds respectively. volume curve has the form shown in Fig. 232. During systolethe ventricles shrink in size as the blood is
. A text-book of physiology : for medical students and physicians . Fig. 232.—Diagram of the normal volume curve (plethysmogram) of the dogs heartwhen beating at a slow rate (after Hirschf elder). The up-stroke represents the systole,the down-stroke the diastole; 4 to 5 the period of diastasis {Henderson). At 5 the auricularcontraction causes a slight additional dilatation of the ventricle. 1,2, and 3 represent thetime of occurrence of the first, second, and third heart-sounds respectively. volume curve has the form shown in Fig. 232. During systolethe ventricles shrink in size as the blood is discharged into theaorta and pulmonary artery—the up-stroke of the curve. Atthe end of the systole, after the closure of the semilunar and the THE HEART BEAT. 551 opening of the auriculoventricular valves, the ventricles aredilated rapidly by the inflow of venous blood. Henderson hasemphasized the fact that the filling takes place nearly as rapidlyas the emptying, owing doubtless to the fact that at the end ofventricular systole the auricles are dilated unde
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