Acetylcholine? and more.?

What is acetylcholine? Also tell me its effect on the plasma membrance of a muscle cell. If the water cells inside and outside a cell suddenly become hydrophobic, would the transport of materials into and out of the cells be affected? and how is it affected? Just help me on these two I don't get. I think... show more What is acetylcholine? Also tell me its effect on the plasma membrance of a muscle cell.

If the water cells inside and outside a cell suddenly become hydrophobic, would the transport of materials into and out of the cells be affected? and how is it affected?

Just help me on these two I don't get. I think I got the second one, but I just wanna double-check.
Update: *On the 2nd one, its not water cells, I meant to say water molecules.
Update 2: *Also, maybe change the hydrophobic to nonpolar. That may make more sense.
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