What causes oxygen to diffuse into the blood from an alveolus (air sac) in the lungs? A) The oxygen concentration in the alveolus is higher than in the atmosphere.
B) The oxygen concentration in the alveolus is lower than in the blood.
C) The oxygen concentration in the atmosphere is higher than the carbon dioxide concentration.
D) The oxygen concentration in the blood is lower than in the alveolus.

c

Explanation:

Just did it

D)

Explanation:

Alveolar concentration is higher in the alveoli (100 mm Hg) than blood (40 mm Hg) in the capillaries. Because this pressure gradient exists, oxygen diffuses down its pressure gradient, moving out of the alveoli and entering the blood of the capillaries where O2 binds to hemoglobin.

answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation:

cells spend most of their time in interphase