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Help!!!

ConfusedKid
in Biology

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Hi everyone

 

Im @ skool, doing triple award science ( 3 science GCSE's) and I need help on some biology stuff. What I need to know is about diffusion.

 

I need to know... How concentration gradient is matained in the a) lungs b) small intestine c) placenta and d) leaf.

 

Please help as soon as possible... Thanks

 

 

 

:confused:

 

Aimee

Read up on osmosis , osmotic pressure & membranes

You will also want to consider counter current exchange as I think this has more to do with diffusion gradients, and maintaining them.

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hi again, i am doing another biology test on monday :-( . the test is about ecosystems,adaption, endandered species,evolution... etc... and there are some questions about whales... does anybody have any tips??

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