This does not always work, because some cells simply push the drug molecules back out using a natural pump mechanism. (newscientist.com)
The same transmitter, acetylcholine, can independently stimulate both a chloride ion conductance and a sodium pump mechanism in the same follower cell by acting on two different postsynaptic receptors. (science.sciencemag.org)
Plants are not like us with pumping mechanism that pushes our blood around, so water moves up the vessel by adhesion (being attracted to the side of the vessel) and cohesion (water molecules being attracted to each other). (science-sparks.com)