| 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 |
| 1. | A, B, C, D, E | 2. | E, A, C, D, B |
| 3. | C, A, B, E, D | 4. | C, B, E, A, D |