Diffusion through cell membranes
- Created by: Jasmin
- Created on: 17-04-13 21:12
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- Diffusion through cell membranes
- Gas exchange in the lungs
- Transfer 02 to blood and remove unwanted CO2 from it
- Lungs contain air sacks - alveoli
- Specialised to maximise diffusion of O2 and CO2
- Enormous SA
- Moist lining for dissolving gases
- Very thin walls
- Good blood supply
- Specialised to maximise diffusion of O2 and CO2
- Villi
- Inside small intestine
- Increased SA so digested food is absorbed and products can move into bloodstream - fuel (respiration) and growth/repair
- Single layer of surface cells
- Good blood supply to assist quick absorption
- Carry away digested food molecules asa diffused from one molecule to another
- Untitled
- Why does food need to be broken down into small soluble molecules
- So diffusion across teh gut lining can take place
- Why does small intestine have a rich blood supply?
- To carry away the digested food to the cells and maintain a steep concentration gradient
- Gas exchange in the lungs
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