. A treatise on anatomy, physiology and hygiene : designed for colleges, academies and families. e expansion of the chest, the muscles thatelevated the ribs relax, together with the diaphragm. Theelasticity of the cartilages of the ribs depresses them,and the cavity of the chest is diminished, attended by theexpulsion of a portion of the air from the lungs. At thesame time, the muscles that form the front walls of the 478. Describe the action of the intercostal muscles upon the How does the elevation of the tenth rib compare with the second? effect has this elevation upon the la
. A treatise on anatomy, physiology and hygiene : designed for colleges, academies and families. e expansion of the chest, the muscles thatelevated the ribs relax, together with the diaphragm. Theelasticity of the cartilages of the ribs depresses them,and the cavity of the chest is diminished, attended by theexpulsion of a portion of the air from the lungs. At thesame time, the muscles that form the front walls of the 478. Describe the action of the intercostal muscles upon the How does the elevation of the tenth rib compare with the second? effect has this elevation upon the lateral diameter of the chest ?480. Describe the process of inspiration. 481. Describe the process bywhich the air is forced out of the lungs. 220 ANATOMY, PHYSIOLOGY, AND HYGIENE. abdominal cavity, contract, and press the alimentary canal,stomach, and Hver, upward against the diaphragm; this, beingrelaxed, yields to the pressure, rises upward,and pressesupon tlie lungs, which retreat before it, and another portionof air is expelled from these organs. This process is calledexpiration. Fig. Fig. 9C. A front view of the chest and abdomen in respiration. 1, 1, The positionof the walls of the chest in inspiration. 2, J, 2, The position of the diaphragm ininspiration 3, 3, The position of the walls of the chest in expiration. 4, 4, 4, Theposition of the diaphragm in expiration. 5, 5, The position of the walls of the abdo-men in inspiration. 6, 6, The position of the abdominal walls in expiration 482. Thus it is obvious that the enlargement of the chest,or inspiration, is produced in two ways : 1st. By the depres-sion of the convex portion of the diaphragm ; 2d. By theelevation of the ribs. On the contrary, the contraction of the Explain fig. 96. 482. In how many ways may the chest be enlarged, andhow is it accomplished ? How ia the contraction of the chest effected ? PHYSIOLOGY OF THE EESPIKATORY ORGANS. 221 chest or expiration, is produced by the depression of the ribs,and eleva
Size: 1283px × 1947px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, booksubjectanatomy, booksubjecthygiene, booksubjectphysiology
