The diagram below shows a cross-section through an alveolus and a capillary. Why does oxygen move from P to Q?

Diagram pleasss

Explanation:

The layers of cells lining the alveoli and the surrounding capillaries are each only one cell thick, so the exchange surfaces are very thin, and they are in close contact with each other. Oxygen therefore diffuses quickly through the alveolar walls and into the capillaries.

Explanation:

its b

explanation:

there is no change

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.