Gas and Solute Exchange

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  • Created by: louise
  • Created on: 03-12-11 12:28

SUBSTANCES MOVE BY DIFFUSION, OSMOSIS AND ACTIVE TRANSPORT

Osmosis = the movement of water from a lower concentration to a higher concentration through a partially permeable membrane - from a dilute solution to a concentrated solution.

Diffusion = the movement of particles or molecules along a concentration gradient - from a region of higher to lower concentration

Active Transport = the movement of particles or molecules against a concentration gradient - from an area of lower concentration to an area of higher concentration which requires energy. (Opposite direction of diffusion)

  • life processes need gases or other dissolved substances before they can happen
  • waste substances also need to move out of the cells so organisms can get rid of them
  • in life processes, the gases and dissolved substances have to move through some sort of exchange surface. The exchange surface structures have to

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