. Animal biology; Human biology. Parts II & III of First course in biology. Biology. THE RESPIRATION 77 a smooth membrane called the pleura. This membrane turns back and lines the chest wall, so that when the chest expands, the two sleek membranes glide over each other with far less friction than would be the case if the lungs and chest wall were touching (Exp. 2). The Respiratory Muscles. --(Repeat Exps. 13, 14, 15.) The chief breathing muscles are the diaphragm (see Figs. 73 and 74), the muscles forming tJic abdominal walls (see Fig. 44), and tivo sets of si tort mus- cles (an internal a
. Animal biology; Human biology. Parts II & III of First course in biology. Biology. THE RESPIRATION 77 a smooth membrane called the pleura. This membrane turns back and lines the chest wall, so that when the chest expands, the two sleek membranes glide over each other with far less friction than would be the case if the lungs and chest wall were touching (Exp. 2). The Respiratory Muscles. --(Repeat Exps. 13, 14, 15.) The chief breathing muscles are the diaphragm (see Figs. 73 and 74), the muscles forming tJic abdominal walls (see Fig. 44), and tivo sets of si tort mus- cles (an internal and an external set), between the ribs. They are called intercostals. (They are the flesh eaten when eating pork ribs.) The diaphragm, which is shaped like a bowl turned upside down, rounds up under the base of the lungs somewhat like a dome and sepa- rates the chest from the ab- domen. Its hollow side is toward the abdomen and its edges are attached to the lowest ribs and the vertebra of the loins. Inspiration is brought about by the rising of the ribs and the descent of the dia- phragm. Expiration takes place when the ribs descend, the abdominal walls draw in, and the transmitted pressure lifts the relaxed diaphragm. -To cause inspiration the diaphragm con- tracts, it flattens and descends, since its edges are attached. FIG. 73. —VERTICAL SECTION OF TRUNK, showing dia- phragm, cavities of thorax and Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bailey, L. H. (Liberty Hyde), 1858-1954. New York, The Macmillan Co.
Size: 999px × 2502px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiology, bookyear1910
