Breathing and Exchange of Gases — BIOLOGY STD 11 Science — Question

For completion of respiration process, write the given steps in sequential manner.

1. Diffusion of gases (O₂ and CO₂) across alveolar membrane.
2. Transport of gases by blood.
3. Utilisation of O₂ by the cells for catabolic reactions and resultant release of CO₂ .
4. Pulmonary ventilation by which atmos-pheric air is drawn in and CO₂ rich alveolar air is released out.
5. Diffusion of O₂ and CO₂ between blood and tissues.