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 atmospheric air is drawn in and CO2  rich alveolar air is released out.
5. Diffusion of O2  and CO2  between blood and tissues.

Answers (1)

The following is the correct sequence:

1. Diffusion of gases (O2 and CO2 ) across the 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 atmospheric air is drawn in and CO2 rich alveolar air is released out.
5. Diffusion of O2 and CO2 between blood and tissues.

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