NEETZoologyBreathing and Exchange of Gases
Match List I with List II regarding the steps of respiration in humans. List I List II A. First step I. Diffusion of O ₂ and CO ₂ between blood and tissues B. Second step II. Transport of gases by the blood C. Third step III. Pulmonary ventilation D. Fourth step IV. Diffusion of gases across alveolar membrane Choose the correct answer from the options given below:
Options
- AA-IV, B-III, C-II, D-I
- BA-III, B-I, C-II, D-IV
- CA-III, B-IV, C-II, D-I
- DA-III, B-IV, C-I, D-II
Correct answer
C. A-III, B-IV, C-II, D-I
Step-by-step solution
According to NCERT, the steps of respiration in humans occur in the following sequence: First step: Breathing or pulmonary ventilation by which atmospheric air is drawn in and CO ₂ rich alveolar air is released out (A matches with III). Second step: Diffusion of gases ( O ₂ and CO ₂ ) across the alveolar membrane (B matches with IV). Third step: Transport of gases by the blood (C matches with II). Fourth step: Diffusion of O ₂ and CO ₂ between blood and tissues (D matches with I). Fifth step: Utilisation of O ₂ by