Select the sequence of steps in respiration.
(A) Diffusion of gases (O₂ and CO₂) across alveolar membrane.
(B) Diffusion of O₂and CO₂between blood and tissues.
(C) Transport of gases by the blood
(D) Pulmonary ventilation by which atmospheric air is drawn in and CO₂ rich alveolar air is released out.
(E) Utilisation of O₂ by the cells for catabolic reactions are resultant release of CO₂
Choose the correct answer from the options given below.

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(B), (C), (E), (D), (A)

(D), (A), (C), (B), (E)

(A), (C), (B), (E), (D)

(C), (B), (A), (E), (D)

answer is A.

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Detailed Solution

D → A → C → B → E

D. Atmospheric air is drawn into alveoli and CO₂-rich alveolar air is released out into the atmosphere (pulmonary
ventilation).

A. Across alveolar membrane, O₂ diffuses into the blood in the pulmonary capillaries and CO₂ diffuses into the alveoli from the blood (pulmonary gas exchange).

C. Blood transports oxygen from the lungs to the tissues (and carbon dioxide from the tissues to the alveoli).

B. O₂ diffuses from the blood in the systemic capillaries into the systemic tissues and CO₂ diffuses from the tissues
to the blood (systemic gas exchange).

E. The cells utilise O₂ for catabolic reactions, resulting in the release of CO

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