What are aquaporins, and what is their significance in cell transport?

Aquaporins are integral membrane proteins that form channels across the cell membrane, specifically facilitating the rapid passage of water molecules. Their significance lies in allowing cells to quickly regulate their water content, which is crucial for processes like maintaining turgor pressure in plant cells, kidney function in animals, and overall cellular hydration. While water can slowly diffuse across the lipid bilayer, aquaporins dramatically increase the rate of water transport.