. Essentials of biology presented in problems. Biology. XXVII. RESPIRATION AND EXCRETION Problem LI. A study of the organs and process of respiro/- tion. {Laboratory Manual, Proh. LI.) (.a) Organs of respiration in frog. (J)) Meclianirs of respiration. (c) Process of respiration in the lungs. Necessity for Respiration.—We have seen that plants and ani- mals need oxygen in order that the life processes may go on. Food is oxidized to release energy, just as coal is burned to give heat to run an engine. As a draft of air is required to make fire under the boiler, so, in the human body, oxygen mus
. Essentials of biology presented in problems. Biology. XXVII. RESPIRATION AND EXCRETION Problem LI. A study of the organs and process of respiro/- tion. {Laboratory Manual, Proh. LI.) (.a) Organs of respiration in frog. (J)) Meclianirs of respiration. (c) Process of respiration in the lungs. Necessity for Respiration.—We have seen that plants and ani- mals need oxygen in order that the life processes may go on. Food is oxidized to release energy, just as coal is burned to give heat to run an engine. As a draft of air is required to make fire under the boiler, so, in the human body, oxygen must be given so that foods or tissues may be oxidized to release energy used in growth. This oxidation takes place in the cells of the body, be they part of a muscle, a gland, or the brain, fBlood, in its circulation to all -parts of the body, is the medium which conveys the oxygen to that -place in the body where it will be used. ' The Organs of Respira- tion in Man. — We have alluded to the fact that the lungs are the organs which give oxygen to the blood and take from it carbon dioxide. The course of air passing from the outside of the lungs in man is much the same as in the frog. Air passes. Air passages in the human lungs: a, larynx; h, trachea (or windpipe); c, d, bronchi; e, bron- chial tubes; /, cluster of air cells. through the nares, the glottis, and into the windpipe. This cartilaginous tube, the top of which may easily be felt as the Adam's apple of the throat, 382. 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 Hunter, George William, 1873-1948. New York, Cincinnati [etc. ] American Book Company
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