Monday, January 10, 2011

Science Form Three: Chapter 1 - Respiration System

Adaptations of alveoli:
  • The alveoli are one cell thick so that there is a short diffusion pathway for the gases and therefore faster diffusion rate.
  • There are a large amount of alveoli to provide a larger surface area for gas exchange so more eefficient.
  • The alveoli are surrounded by a vast network of capillaries, this increases the surface area of alveoli which are in contact with a capillary and allows for more efficient gas exchange.
  • The alveoli walls are moistened, so gaseous exchange is more efficient through diffusion

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