Q. Arrange the given steps of respiration in the sequence of event they occur I. Diffusion of gases, $O_{2}$ and $CO_{2}$ across the alveolar membrane II. Transport of gases by the blood III. Utilisation of $O_{2}$ by the cells for catabolic reactions and the resultant release of $CO_{2}$ IV. Pulmonary ventilation by which atmospheric air is drawn in and $CO_{2}$ rich alveolar air is released out V. Diffusion of $O_{2}$ and $CO_{2}$ between the blood and tissue Choose the correct option
A) III $\rightarrow$ V $\rightarrow$ II $\rightarrow$ I $\rightarrow$ IV
B) III $\rightarrow$ II $\rightarrow$ V $\rightarrow$ I $\rightarrow$ IV
C) V $\rightarrow$ IV $\rightarrow$ III $\rightarrow$ II $\rightarrow$ I
D) I $\rightarrow$ II $\rightarrow$ III $\rightarrow$ IV $\rightarrow$ V
Explanation
Major steps involving respiration are Step I Utilisation of $O_{2}$ by cell for catabolic reactions Step II Diffusion of $O_{2}$ and $CO_{2}$ between blood and tissues Step III Transportation by blood Step IV Diffusion of gases ($O_{2}$ and $CO_{2}$) through alveolar membrane Step IV $CO_{2}$ goes out and atmospheric air is drawn in
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.