The laws and mechanics of circulation, with the principle involved in animal movement . ltaneously tillpressure is again uniform, the one by reflux action throughthe route of ingress, the other into the left chambers of theheart and arterial system, the valves at the right side ofthe heart compelling this circumstance by preventing reflux,as in the case of the air in the air passages. From thisarrangement, then, it is very readily perceived that currentsof air and blood should flow in and out of the alveolisimultaneously during respiration, the one necessarily involv-ing the other. But to this
The laws and mechanics of circulation, with the principle involved in animal movement . ltaneously tillpressure is again uniform, the one by reflux action throughthe route of ingress, the other into the left chambers of theheart and arterial system, the valves at the right side ofthe heart compelling this circumstance by preventing reflux,as in the case of the air in the air passages. From thisarrangement, then, it is very readily perceived that currentsof air and blood should flow in and out of the alveolisimultaneously during respiration, the one necessarily involv-ing the other. But to this we must add the arrangementsin the heart and vascular system for bringing the blood into 38 LUNGS AND VENOUS SYSTEM. correspondence with the circulation of air in the alveoli, therebeing a given measure of each, for which special adjustmentsobtain in the compartments, as also for producing an uninter-rupted flow of blood through the lungs, and the whole schemein respiration will be readily apprehended. First of all, letit be understood that the generation of force in the organism j. Fig. 7.—Diagrammatic representation of the Venous System, showing the relations itsustains to the Lungs. A, A, A, venous system represented as pyramids, with thebases in the tissues and the apices at the heart and lungs (E, C) ; B, pulmonary-artery ; D, trachea ; F, diaphragm ; L, atmosphere. is the purpose of all these arrangements, and this can only bedone by means of the pumping actions in the lungs, withwhich everything must have adjustment; hence would includethe intestines with the blood-vascular and lymphatic systems, TWO EESPIRATORY MOVEMENTS. 39 since it all relates to circulation and the supply of the cell-brood in the tissues, through whose agencies the specialphenomena are evolved. Finally, we have to mention the existence of two respiratorymovements performing at the same time in the body, notablyone in the lungs, the other in the tissues ; the former for pump-ing the commerce in the
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Keywords: ., bookcentury1800, bookde, booksubjectblood, booksubjectrespiration
