NEET Zoology Mechanism of Breathing MCQ Question
During the mechanism of breathing, if the partial pressure of CO2 in the alveoli is 40 mmHg and in the blood arriving at the alveoli is 46 mmHg, what is the direction of CO2 diffusion?
From blood to alveoli
From alveoli to blood
There is no diffusion
Diffusion occurs equally in both directions
Correct Answer
Detailed Explanation
CO2 diffuses from areas of higher partial pressure to areas of lower partial pressure. Since the partial pressure of CO2 in the blood is higher than in the alveoli, CO2 will diffuse from blood to alveoli.
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