Question

Oxygen enters the cell by diffusion when the level of oxygen inside the cells :-

a ) increases
b ) decreases
c ) remains the same
d ) first increases then decreases​

Answer 1

Oxygen and carbon dioxide, dissolved in water, are exchanged by diffusion in the lungs: oxygen moves down a concentration gradient from the air in the alveoli to the blood. carbon dioxide moves down a concentration gradient from the blood to the air in the alveoli.Normally, oxygen is a perfusion-limited gas, which allows us to markedly increase the rate of its uptake by varying the pulmonary blood flow. However, in the cases, oxygen exchange can become a diffusion-limited affair.

hence increases a)

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