. True manhood : a manual for young men . 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 th
. True manhood : a manual for young men . 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 Fig. XXXIV. Bronchial tubes ajid air cells in lungs. We here see these little air cells, through whichthis wonderful process of osmosis takes place. Thefirst cut gives them entire. The second shows themlaid open. Venous blood is impregnated with a poisonous gascalled carbonic acid gas. This is upon one side of themembrane, and oxygen is upon the other side. Theyexchange places by osmosis. The former passes upthe bronchial tubes and windpipe and goes out of themouth and nose with the outgoing breath, called expi-ration. It was the presence of the carbonic acid gaswhich gave the purple hue to the blood; oxygennow exchanges that color for a bright scarlet red. Amultitude of cells mostly of a red hue, though a feware white, fairly bound and dance with life, and all TRUE MANHOOD. 131
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