In humans, respiration occurs in the following steps. Arrange these steps in the correct order. A. Diffusion of O _2 and CO _2 between blood and tissues. B. Diffusion of O _2 and CO _2 across alveolar membrane. C. Pulmonary ventilation by which atmospheric air is drawn in and CO _2 rich alveolar air is released out. D. Cellular respiration. E. Transport of gases by the blood. Choose the correct answer from the options given below :
C. C, B, E, A, D
The steps of respiration in humans occur in the following sequence: First, pulmonary ventilation (breathing) takes place, by which atmospheric air is drawn in and CO _2 rich alveolar air is released out (C). Second, diffusion of gases ( O _2 and CO _2) occurs across the alveolar membrane (B). Third, transport of gases is carried out by the blood (E). Fourth, diffusion of O _2 and CO _2 takes place between the blood and tissues (A). Finally, cellular respiration occurs, where O _2 is utilised by the cells for catabolic reactions and CO _2 is released (D). The correct sequence is C, B, E, A, D. Answer: C, B, E, A, D
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