Which of the following is a correct sequence of steps involved in respiration?
A- Utilisation of O₂ by body cells
B- Transport of gases by blood up to tissues
C- Pulmonary ventilation
D- Diffusion of gases at alveolar surface
E- Exchange of gases between blood and tissues

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C $\to$ E $\to$ B $\to$ D $\to$ A

C $\to$ D $\to$ B $\to$ E $\to$ A

D $\to$ B $\to$ E $\to$ A $\to$ C

D $\to$ E $\to$ B $\to$ C $\to$ A

answer is B.

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Detailed Solution

The correct sequence of steps involved in respiration is:

C- Pulmonary ventilation: This is the process of breathing, where air is moved in and out of the lungs.
D- Diffusion of gases at alveolar surface: Oxygen diffuses from the alveoli into the blood, and carbon dioxide diffuses from the blood into the alveoli.
B- Transport of gases by blood up to tissues: Oxygen is carried by hemoglobin in the blood to the tissues, while carbon dioxide is transported back to the lungs.
E- Exchange of gases between blood and tissues: Oxygen is delivered to tissues, and carbon dioxide is absorbed by the blood.
A- Utilisation of O2 by body cells: Finally, oxygen is used by cells for metabolic processes, and carbon dioxide is produced as a waste product.

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