. A text-book on physiology : for the use of schools and colleges : being an abridgment of the author's larger work on human physiology. White corpuscles in the still layer. Describe the structure of the veins. What veins have no valves ? 126 STEUCTUEE OF THE VEINS. Valves of veins double, or triple flaps, in all instances opening towardthe heart. The blood flows equably in them, the pulsa-ting action of the ventricles having disappeared in thecapillaries. Since they present an aggregate capacitytwo or three times that of the arteries, the motion ofthe circulation in them is pr
. A text-book on physiology : for the use of schools and colleges : being an abridgment of the author's larger work on human physiology. White corpuscles in the still layer. Describe the structure of the veins. What veins have no valves ? 126 STEUCTUEE OF THE VEINS. Valves of veins double, or triple flaps, in all instances opening towardthe heart. The blood flows equably in them, the pulsa-ting action of the ventricles having disappeared in thecapillaries. Since they present an aggregate capacitytwo or three times that of the arteries, the motion ofthe circulation in them is proportionably slower. Fig. 52 is a diagram show-ing the manner in whichthe valves open whenthe blood flows in thecourse indicated bythe arrows. Fig. 53shows their applica-tion to each other, or Valves of veins shut. to the gideg Qf the vein, and the consequent bulging of that vessel whenthe current, as indicated by the arrows, is in the oppo-site direction. Having now described the structure and action of theheart, the arteries, capillaries, and veins respectively, asfar as is necessary, it remains to group those actions to-gether, and present the theory of the circulation at oneview. But, before entering on this, it is proper to offer anargument against the doctrine of those physiologistsw
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Keywords: ., bookautho, bookcentury1800, bookdecade1860, booksubjectphysiology
