Factors Affecting Gas Exchange

Factors Affecting Diffusion Rate

• Concentration Gradient:

  • A steeper concentration gradient results in a faster diffusion rate.

• Surface Area for Diffusion:

  • A larger surface area increases the diffusion rate.

• Length of Diffusion Pathway:

  • A longer diffusion pathway decreases the diffusion rate.

• Temperature:

  • Higher temperatures lead to more collisions with the diffusion surface, increasing the rate.

• Moist Surface:

  • Moisture is crucial for dissolving gases, which is necessary for them to diffuse across the surface.

• Solubility and Size of Particle:

  • In the lungs, despite oxygen being smaller than carbon dioxide, carbon dioxide diffuses approximately 20 times faster than oxygen due to its higher solubility.

Blood Supply to Area (in animals)

• Effective concentration gradients are maintained by continuously delivering and removing gases from the area via blood supply.