NEET 2026 — Biology solution

NEET2026Biology

In humans, respiration occurs in the following steps. Arrange these steps in the correct order.

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

Choose the correct answer from the options given below

Solution

Respiration in humans proceeds as follows:

(i) Pulmonary ventilation: atmospheric air is drawn in and CO $_{2}$ -rich alveolar air is released out (C).

(ii) Diffusion of O $_{2}$ and CO $_{2}$ across the alveolar membrane (B).

(iii) Transport of gases by the blood (E).

(iv) Diffusion of O $_{2}$ and CO $_{2}$ between blood and tissues (A).

(v) Cellular respiration — utilisation of O $_{2}$ for catabolic reactions with release of CO $_{2}$ (D).

Correct order: C → B → E → A → D.

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