the movement of substances into and out of a cell 2
- Created by: Linnea Rajal
- Created on: 06-03-13 19:43
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- The movement of Substances into and out of cells
- single celled organism has a relatively large surface area to volume ratio
- all the necessary exchanges occur via surface membrane
- The size and complexity of an organism increase the difficulty of exchanging materials
- In multicellular organisms many organ systems are specialised for exchanging materials
- The effectiveness of an exchange surface is increased by:
- having a large surface area that is thin, to provide a short diffusion path
- (in animals) having an efficient blood supply
- (in animals, for gaseous exchange) being ventilated
- Gases and solute exchange surfaces in humans and other organisms are adapted to maximise effectiveness
- single celled organism has a relatively large surface area to volume ratio
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