Oxygen concentration in the blood

Which one of the following movements will be severely and immediately disrupted if the oxygen concentration in the blood becomes very low?

A. carbon dioxide from the blood into the alveoli

B. glucose from the lumen of the intestine into the villi

C. oxygen from the alveoli into the blood

D. urea from the blood plasma into the nephron

E. water from the blood plasma into the nephron

Hi!
We need to work which process needs oxygen to work (i.e which ones are active and which ones are Passive) active process needs energy to occur and so need oxygen for Aerobic respiration to produce that energy (ATP).
Only B is an active process so would be the only one disrupted by low oxygen concentration as respiration to produce energy/ATP will not occur.
Hope it helps:)

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Thanks. This makes me so clear.

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