Describe the steps involves in respiration

Answer:

Respiration involves the following steps:

(i) Breathing or pulmonary ventilation by which atmospheric air is drawn in and CO₂ rich alveolar air is released out.

(ii) Diffusion of gases (O₂ and CO₂) across alveolar membrane.

(iii) Transport of gases by the blood.

(iv) Diffusion of O₂ and CO₂ between blood and tissues.

(v) Utilisation of O₂ by the cells for catabolic reactions and resultant release of CO₂.