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 alve

Question

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 thecorrectanswer from the options given below :NEET 2026 (Cancelled)

TestHub · Accepted Answer

The steps of respiration in humans occur in the following sequence:

First, pulmonary ventilation (breathing) takes place, by which atmospheric air is drawn in and $CO_{2}$ rich alveolar air is released out (C).

Second, diffusion of gases ( $O_{2}$ and $CO_{2}$ ) occurs across the alveolar membrane (B).

Third, transport of gases is carried out by the blood (E).

Fourth, diffusion of $O_{2}$ and $CO_{2}$ takes place between the blood and tissues (A).

Finally, cellular respiration occurs, where $O_{2}$ is utilised by the cells for catabolic reactions and $CO_{2}$ is released (D).

The correct sequence is C, B, E, A, D.

Answer: C, B, E, A, D

Zoology - Breathing and Exchange of Gases Question with Solution | TestHub

Options:

Doubts & Discussion