. The comparative physiology of respiratory mechanisms. Respiration. TRACHEAL RESPIRATION 125 horizontal tube 2. The expirations are seen to be active, and the equilibrium position of the whole system is the inspiratory. The normal depth of respiration which varied but little is about 40 mm3 in an animal of 1 g weight. The vital capacity. Fig. 70. Experimental arrangement to study respiration in air-breathing aquatic insects. See text. (Krogh.) could be determined in different ways of which one was to allow the animal to breathe pure oxygen from a slow current of the gas through the tube 4 sea
. The comparative physiology of respiratory mechanisms. Respiration. TRACHEAL RESPIRATION 125 horizontal tube 2. The expirations are seen to be active, and the equilibrium position of the whole system is the inspiratory. The normal depth of respiration which varied but little is about 40 mm3 in an animal of 1 g weight. The vital capacity. Fig. 70. Experimental arrangement to study respiration in air-breathing aquatic insects. See text. (Krogh.) could be determined in different ways of which one was to allow the animal to breathe pure oxygen from a slow current of the gas through the tube 4 sealed on with plasticene to the top of the funnel 3. When the tracheae were filled with oxygen the normal stimulus for respiration would be much delayed, the ventilation tracheae would collapse completely, and when the animal arrived at the surface some ineffectual attempts would precede the sudden opening up. The vital capacity volume recorded by this was 60 mm3 and was confirmed also by a different method. The total capacity finally was de- termined by letting the animal breathe from a bubble of known size and containing an indifferent gas which could be determined by analysis. From the dilution found after a series of respirations the total capacity of the tracheal system could be calculated and was found in the case considered to be 90 mm3. By a short series of normal respirations the air. 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 Krogh, August, 1874-1949. Philadelphia, University of Pennsylvania press
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