Question

2. During ______ oxygen diffuses from lungs into blood

Answer 1

Explanation:

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. ... The oxygen molecules move, by diffusion, out of the capillaries and into the body cells.

Answer 2

Answer:

Oxygenated air, taken in during inhalation, diffuses across the surface of the lungs into the bloodstream, and carbon dioxide diffuses from the blood into the lungs and expelled during exhalation.