For water to travel across the cell membrane at a substantial rate, the water molecules travel through protein channels known as aquaporins

Large amounts of water can freely move across the cell membrane through aquaporins they are integral membrane proteins that serve as passageways in the movement of water, and in some cases, small particles can cross the membrane.

Aneutral atom must have the same number of neutrons and protons? no, they must have the same number of protons and electrons