Question

What causes oxygen to diffuse into the bloodstream? (at the alveolus)
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Answer 1

Answer:

The oxygen enters the bloodstream from the alveoli, tiny sacs in the lungs where gas exchange takes place (Figure below). The transfer of oxygen into the blood is through simple diffusion. ... While oxygen moves from the capillaries and into body cells, carbon dioxide moves from the cells into the capillaries.

Explanation:

respiratory system's primary function is to breathe in air, absorb oxygen into the bloodstream and breathe out carbon dioxide. ... This oxygen is then taken through the blood to the rest of your body, where it is used to produce energy.

Answer 2

Answer:

when there is a deficiency of Oxygen in the bloodstream Oxygen diffuses too the red blood cells