. Physiology, experimental and descriptive . Increased Air Inspiration Expiration Fig. 45. Diagrammatic Sections of the Body in Inspiration and Expiration. pillow would spring up as soon as the pressure was stopped,because of its own elasticity as well as that of the , as soon as the diaphragm relaxes, the elastic wallsof the abdomen retreat, and the abdominal organs rise to theirformer place. When the ribs are elevated, the cartilages which connectthe ventral ends of the bony parts of the ribs with the breast-bone are slightly bent. When the muscles relax, the elasti-city
. Physiology, experimental and descriptive . Increased Air Inspiration Expiration Fig. 45. Diagrammatic Sections of the Body in Inspiration and Expiration. pillow would spring up as soon as the pressure was stopped,because of its own elasticity as well as that of the , as soon as the diaphragm relaxes, the elastic wallsof the abdomen retreat, and the abdominal organs rise to theirformer place. When the ribs are elevated, the cartilages which connectthe ventral ends of the bony parts of the ribs with the breast-bone are slightly bent. When the muscles relax, the elasti-city of the rib cartilages helps to bring the ribs back to theirformer position, thus reducing the chest to its former width. INSPIRATION AND EXPIRATION. 115 Thus we see why expiration is easy; in fact, does itself (in ordinary respiration), by the elastic reactions inspiration is harder than it would be if it were not forthe fact that the descent of the diaphragm meets resistance,and the ribs, in rising, have to overcome resistance in bendingthe costa
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