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Breathing and Exchange of Gases — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYBreathing and Exchange of Gases3 Marks
Question
For completion of respiration process, write the given steps in sequential manner.
a. Diffusion of gases $\left(\mathrm{O}_2\right.$ and $\left.\mathrm{CO}_2\right)$ across alveolar membrane.
b. Transport of gases by blood.
c. Utilisation of $\mathrm{O}_2$ by the cells for catabolic reactions and resultant release of $\mathrm{CO}_2$.
d. Pulmonary ventilation by which atmos-pheric air is drawn in and $\mathrm{CO}_2$ rich alveolar air is released out.
e. Diffusion of $\mathrm{O}_2$ and $\mathrm{CO}_2$ between blood and tissues.
✓

Answer

Following is the correct sequence:
a. Diffusion of gases $\left(\mathrm{O}_2\right.$ and $\left.\mathrm{CO}_2\right)$ across alveolar membrane.
b. Transport of gases by blood.
c. Utilisation of $\mathrm{O}_2$ by the cells for catabolic reactions and resultant release of $\mathrm{CO}_2$.
d. Pulmonary ventilation by which atmos-pheric air is drawn in and $\mathrm{CO}_2$ rich alveolar air is released out.
e. Diffusion of $\mathrm{O}_2$ and $\mathrm{CO}_2$ between blood and tissues.

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