Features of a good exchange surface

- Big surface area provides > space for molecules to pass - < barrier reduces diffusion distance - Fresh supply of molecules on one side to keep the concentration high and removal of required molecules on the other side

Define: exchange surface

specialised area that is adapted to make it easier for molecules to cross from one side of the surface to the other

Define: gaseous exchange

Gaseous exchange is the movement of gases by diffusion between an organism and its environment across a barrier such as the alveolus wall.

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Biology - Module 2

Question	Answer
Features of a good exchange surface	- Big surface area provides > space for molecules to pass - < barrier reduces diffusion distance - Fresh supply of molecules on one side to keep the concentration high and removal of required molecules on the other side
Define: exchange surface	specialised area that is adapted to make it easier for molecules to cross from one side of the surface to the other
Define: gaseous exchange	Gaseous exchange is the movement of gases by diffusion between an organism and its environment across a barrier such as the alveolus wall.