Some cells express aquaporin proteins-they are channel proteins that facilitate the flow of water molecules through the plasma membrane.What regulates the rate and direction of water diffusion across the membrane?

Question

Quizplus · Accepted Answer

The rate and direction of water diffusion across the membrane are regulated by solute concentrations on either side of the membrane. Water will diffuse from an area of low solute concentration to an area of high solute concentration in an effort to balance out the solute concentrations. This is known as osmosis. Aquaporin proteins only facilitate the movement of water molecules, they do not regulate the direction or rate of movement. Resting membrane potential and availability of ATP do not directly affect water diffusion.

Some Cells Express Aquaporin Proteins-They Are Channel Proteins That Facilitate