Scheme of Model 1.Five bottles labeled with number 1 to 5 were used and were connected by rubber and glass tubing. No. 5 is a syringe of 50 C.C. without the piston. The top panel is a simulated SVR connected with a negative-positive-pressure-generator (Bottle No.2 and 3) through rubber and glass tubing. The bottom panel is the simulated PVR. SCC = simulated chest cavity, SLV = simulated left ventricle, SRV = simulated right ventricle, SVR = systemic venous return system, PVR = pulmonary venous return system.
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