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7th February 2024

Gas diffusion

Gas exchange is affected by a few factors,

  • Gas
    • Solubility
    • Molecular mass
    • Concentration gradient
  • Surface area
  • Distance to travel during diffusion

Oxygen and carbon dioxide are exchanged between pulmonary circulation and alveoli.

MRCP Part 1 - Schematic of the alveolus

Image Source: Wikimedia Commons (2018). Cross section of an alveolus and capillaries showing diffusion of gases, Licensed under a creative commons licence. Available for free at: https://upload.wikimedia.org/wikipedia/commons/1/13/Cross_section_of_an_alveolus_and_capillaries_showing_diffusion_of_gases.svg  (Accessed: 4 January 2024).

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