Q. Arrange the given steps of respiration mechanism in the order, they occur in the human body I. Breathing or pulmonary ventilation II. Diffusion across the alveolar membrane III. Transport of gases by blood IV. Utilisation of $O_{2}$ by cells V. Diffusion of $O_{2}$ and $CO_{2}$ between blood and tissues Choose the correct option
A) I $\rightarrow$ II $\rightarrow$ III $\rightarrow$ IV $\rightarrow$ V
B) I $\rightarrow$ II $\rightarrow$ III $\rightarrow$ V $\rightarrow$ IV
C) I $\rightarrow$ III $\rightarrow$ II $\rightarrow$ V $\rightarrow$ IV
D) I $\rightarrow$ III $\rightarrow$ II $\rightarrow$ IV $\rightarrow$ V
Explanation
Respiration involves the following steps (i) Breathing or pulmonary ventilation by which atmospheric air is drawn in and $CO_{2}$ rich alveolar air is released out (ii) Diffusion of gases, i.e., $O_{2}$ and $CO_{2}$ across alveolar membrane (iii) Transport of the gases by blood (iv) Diffusion of $O_{2}$ and $CO_{2}$ between the blood and tissue (v) Utilisation of $O_{2}$ by the cells for catabolic reactions and the resultant release of ${CO}_{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.