Water crosses the plasma membrane at a rate faster than expected for simple diffusion because of

Question

Quizplus · Accepted Answer

Water crosses the plasma membrane at a rate faster than expected for simple diffusion because of the presence of water channels called aquaporins and the hydration of the ions as they pass through. Aquaporins increase the rate of water movement by creating a pathway through the hydrophobic interior of the plasma membrane. The ions present in the extracellular fluid assist in the passage of water molecules because of their hydration shells. Therefore, both options a and b are correct.

Water Crosses the Plasma Membrane at a Rate Faster Than