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question about simple diffusion

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question about simple diffusion

Postby biohelp22 » Sun Apr 23, 2006 2:30 pm

what would be an example of simple diffusion across a membrane?

a. the movement of H+ across a thylakoid membrane during photo synthesis
b. the uptake of neurotransmitters by the postsynaptic membrane during the transmission of a nerve membrane
c. the moviement of oxygen in the alveoli across the epithelial membrane and into the bloodstream
d. the exchange of sodium and potassium across a cell membrane through the Na +/ K+ pump
e. the movement of glucose across the body cell membranes and the cells of the liver, which stores it as glycogen

i understand diffusion and everything
this question just confuses me :cry:
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Postby d00d » Mon Apr 24, 2006 1:45 am

to me, the most likely one seems to be C.

they're talking about O2 going from a low pp to a high pp down a concentration gradient.

all the others are either active transport or facilitated diffusion.
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Postby Poison » Mon Apr 24, 2006 5:37 pm

The same question is asked previously.

about6048.html

And yes, the answer is C.
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