The laws and mechanics of circulation, with the principle involved in animal movement . nward, projecting into the excavation like the diaphragm inthe chest-excavation, the convexity toward the lungs ; hence,when they contract, tend to pull away from the lungs, therebyreducing pressure in the excavation the same as in the othercase, the air rushing into the locality simultaneously to KESPIKATIOIST IIST CHELOISTIA. 421 equalize pressure, the lungs, of course, acting in concertwith the respiratory muscles as with the diaphragm. Aswill be seen, the lungs (Fig. 173, z, z) are very large, cov-ering
The laws and mechanics of circulation, with the principle involved in animal movement . nward, projecting into the excavation like the diaphragm inthe chest-excavation, the convexity toward the lungs ; hence,when they contract, tend to pull away from the lungs, therebyreducing pressure in the excavation the same as in the othercase, the air rushing into the locality simultaneously to KESPIKATIOIST IIST CHELOISTIA. 421 equalize pressure, the lungs, of course, acting in concertwith the respiratory muscles as with the diaphragm. Aswill be seen, the lungs (Fig. 173, z, z) are very large, cov-ering the entire viscera upon the dorsal surface; and whilenumerous longitudinal and transverse septa divide and sub-divide the interior (Fig. 174), the chambers are comparativelylarge and freely communicate with each other and the primi-tive division of the trachea (a), the bristles indicating this cir-cumstance ; they are not bound down or fastened by the liningmembrane so as to limit the action, but are free to move, glid-ing readily to and fro upon the viscera in respiration, expand-. ing. 172.— Showing the Myology of the Tortoise (Emys Europcea), with the specialmuscles relating to respiration.—Bojanus. Anatome Testudinis Europaea. 41, Transversus abdominis; 40/7, obliquus abdominis; 42, diaphrag-maticus ; 57, serratus magnus. ing laterally as well as longitudinally, the copious secretionsin the parts enabling this action, as also the actions appertain-ing to the viscera themselves in connection with their specialf unctions, or the same as obtains in warm-blooded , for effecting coordination with respiration, we havethe nerves proceeding to the several parts from the spinalmedulla (Fig. 192), inclusive of the heart and vessels, all theparts being fully coordinated for producing a balance in force,the same as in all the animals, and must be so, in the nature ofthings ; the thoracic duct (c) coursing upon the aortse to reachthe chyle receptacles
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Keywords: ., bookcentury1800, bookde, booksubjectblood, booksubjectrespiration
