. True manhood : a manual for young men . Fig. XXXII. Tubing view of lungs, j, fulmonmy artery; 7, ascend-ing cava; 6, aorta; 4^ heart; 14, left lung; ij, right luvg. enters its right side and passes out by the pulmonaryartery. This divides and sub-divides like the branches (128) TRJJE MANHOOD. 129 of a tree, as seen in Fig. XXXIL, and spreads overboth sides of the lungs. Its minutest branches endin a delicate network of capillaries. These arteriesare all filled with dark-colored venous blood sent herefor the purpose of being still further perfected. We find also in the lungs innumerable air c
. True manhood : a manual for young men . Fig. XXXII. Tubing view of lungs, j, fulmonmy artery; 7, ascend-ing cava; 6, aorta; 4^ heart; 14, left lung; ij, right luvg. enters its right side and passes out by the pulmonaryartery. This divides and sub-divides like the branches (128) TRJJE MANHOOD. 129 of a tree, as seen in Fig. XXXIL, and spreads overboth sides of the lungs. Its minutest branches endin a delicate network of capillaries. These arteriesare all filled with dark-colored venous blood sent herefor the purpose of being still further perfected. We find also in the lungs innumerable air cells orvesicles. All the cells hitherto studied are filled with. Fig. XXXm. Cell view of the lungs. 11, trachea or ivindpife;<?, 9, brojichial tubes; jg^ ig, ig^ sub-diiisions of latter; 20., 20^ cells^ liquid ; these contain air or gas. The air is drawn inat the mouth and nostrils, and passes down the throatinto the lungs by a tube named trachea or windpipe(Fig. XXXIII). The trachea divides at its lowertermination into two branches, one for each lung: I30 TRUE MANHOOD. they are called bronchial tubes. These in their turndivide and sub-divide until they become so small theycannot be seen with the naked eye. At their minutest ends are placed the six hundredmillion air vesicles. These lie among the pulmonarycapillaries as in a plexus. Kvc rushes down thetrachea and filling the bronchial tubes even to theirminutest branches, meets the venous blood throughthe cell membranes.
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