ConfusedKid Posted February 26, 2007 Share Posted February 26, 2007 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 Aimee Link to comment Share on other sites More sharing options...
JHAQ Posted February 26, 2007 Share Posted February 26, 2007 Read up on osmosis , osmotic pressure & membranes Link to comment Share on other sites More sharing options...
ConfusedKid Posted February 27, 2007 Author Share Posted February 27, 2007 Ok will do thank you Link to comment Share on other sites More sharing options...
psynapse Posted February 27, 2007 Share Posted February 27, 2007 You will also want to consider counter current exchange as I think this has more to do with diffusion gradients, and maintaining them. Link to comment Share on other sites More sharing options...
ConfusedKid Posted March 2, 2007 Author Share Posted March 2, 2007 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?? Link to comment Share on other sites More sharing options...
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