In humans, which among these is not a step in respiration

Options

(a) Pulmonary ventilation
(b) Alveolar diffusion of O₂ and CO₂
(c) Diffusion of O₂ and CO₂ between blood and tissues
(d) Utilization of CO₂ by cells for catabolic reactions

Correct Answer:

Utilization of CO₂ by cells for catabolic reactions

Explanation:

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