. Nutritional physiology . in the samestate. To this large volume the tissues have added a mod-erate quantity of water—say 250 grams—which is a truemetabolic product. This has been formed by the oxidationof compounds containing hydrogen. The water outputof the body is inevitably greater in the long run than thewater income. This fact may be disguised on single daysby water retention. Carbon Dioxid Elimination.—Respiration has beendefined as the process within the living cells in course ofwhich complex organic molecules are decomposed and 167 1G8 NUTKITIUNAL PHYSIOLOGY more or less completely o
. Nutritional physiology . in the samestate. To this large volume the tissues have added a mod-erate quantity of water—say 250 grams—which is a truemetabolic product. This has been formed by the oxidationof compounds containing hydrogen. The water outputof the body is inevitably greater in the long run than thewater income. This fact may be disguised on single daysby water retention. Carbon Dioxid Elimination.—Respiration has beendefined as the process within the living cells in course ofwhich complex organic molecules are decomposed and 167 1G8 NUTKITIUNAL PHYSIOLOGY more or less completely oxidized. Carbon dioxid is themost conspicuous product. The respiratory exchangesoccur in the different tissues in a measure corrosiwndingwith the extent to which they severally evohc skeletal muscles lead in ainoimt of respiration (andof carbon dioxid set free), both because of their great massand by reason of their activity. The glands, especiallythe liver and the kidneys, contribute largely to the Cap _Ai«^°PCorp. Fig. 21.—I is intended to suggest tlie form of an air-sac of thelung overlaid with a network of capillaries belonging to the pul-monary system. II is an imaginary section through such an air-sac. B in both I and II is the minute bronchial tube through whichthe air is renewed. Ill is a bit of detail from II, still more en-larged, showing two capillaries (Cap.) conveying corpuscles (Corp.).The air is close by (Al), yet two partitions intervene, the capillarywall and the wall of the air-sac. So does the heart. Other tissues have a minor part in thegeneral respiration. Some which are passive and stable,like cartilage, can have l)ut little. The carbon dioxid formed by the cells is first transferredto the hmph. The concentration of the gas in the lymphleads to its passage into the blood. A gas will always passfrom a higher to a lower concentration when the two solu-tions are placed in communication. The dehcate capillary REMOVAL OE THE END-PRO
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu31, booksubjectnutrition
