. Principles of zoölogy : touching the structure, development, distribution, and natural arrangement of the races of animals, living and extinct with numerous illustrations : Part 1, Comparative physiology : for the use of schools and colleges. Fig. 89. Or RESPIIx-TION. 119. the vertebral column, and enclosing the heart 7i) betweenihem, (Fig. 90,1 I.) The lungs communicate with the atmos-phere by means of a tube composed of cartilaginous ringswhich arises from the back part of the mouth, and dividesbelow, first into a branch for each organ, and then into in-numerable branches penetrating their
. Principles of zoölogy : touching the structure, development, distribution, and natural arrangement of the races of animals, living and extinct with numerous illustrations : Part 1, Comparative physiology : for the use of schools and colleges. Fig. 89. Or RESPIIx-TION. 119. the vertebral column, and enclosing the heart 7i) betweenihem, (Fig. 90,1 I.) The lungs communicate with the atmos-phere by means of a tube composed of cartilaginous ringswhich arises from the back part of the mouth, and dividesbelow, first into a branch for each organ, and then into in-numerable branches penetrating their „,whole mass, and finally terminating inminute sacs. This tube is the tracheaor ivindpipe., (zy,) and its branches arethe bronchi. In the higher air-breath-rng animals the lungs and heart occupyan apartment by themselves, the chest,which is separated from the other con-tents of the lower arch of the vertebralcolumn, (161,) by a fleshy partition,called the diaphragm^ passing acrossthe cavity of the body, and arching up into the chest. Theonly access to this apartment from without is by the glottis,(Fig. 22, 0,) through the trachea. 248. The mechanism of respiration by lungs may be com-pared to the action of a bellows. The cavity of the chest isenlarged by raising t
Size: 1260px × 1984px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1860, booksubjectp, booksubjectzoology
