Exchange surfaces and gas exchange

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Question 2
Medium

The alveolar wall and the capillary wall are both extremely thin, each being only one cell thick.

Cross-section of an alveolus adjacent to a blood capillary. The diagram highlights the extremely thin pathway between the air space inside the alveolus and the blood inside the capillary. Arrows indicate oxygen molecules moving from the air space, through the one-cell-thick alveolar wall, across the tiny interstitial gap, and through the one-cell-thick capillary wall into the blood plasma and red blood cells. Another set of arrows shows carbon dioxide moving in the opposite direction.

Explain how oxygen moves from the air inside the alveolus into the blood.

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Exchange surfaces and gas exchange Questions

  1. GCSE
  2. /Biology
  3. /Exchange surfaces and gas exchange