512 



THE OUTGO OF ENERGY 



the slighter resistance due to friction in the rubber 

 and glass tubes. 



In this system the pump represents the left ven- 

 tricle ; the valves in the inlet and outlet tubes, the 



Fig. 68. Quantitative circulation scheme ; about one-fourth the actual 

 size. 



mitral and aortic valves, respectively ; the. resistance 

 of the channels in the bamboo, the resistance of the 

 small arteries and capillaries. The tubes between 

 the pump and the resistance are the arteries; those 

 on the distal side of the resistance 'are the veins. 



