Biology 3.1.1 Features of exchange surfaces

Question	Answer
Define diffusion	The net movement of particles from a reigon of higher concentration to an area of lower concentration
Fill in the gap: As an organsism gets bigger, its ______/_______ volume also increases	Surface area/ volume
What four features of an exchange surface effect the rate of diffusion?	Surface area Thickness Concentration gradient Moistness
Explain how concentration gradient effects the rate of diffusion	The greater the concentration gradient, the quicker diffusion will take place
Explain how the thickness of a surface may effect the rate of diffusion	The thinner the surface, the shorter the diffusion pathway so the faster the diffuion is
Explain why cells must be kept moist	Water will always diffuse out of the cell on the cell surface but if too much water is lost, then the plasma membrane will break down and the cell will die

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	Created by Sam Gunnell about 5 years ago