water channel

In biology, a "water channel" refers to a specialized protein molecule within cell membranes that facilitates the passage of water in and out of cells. These channels, also known as aquaporins, are crucial for living organisms, enabling cells to maintain proper water balance.1

While the term "water channel" can also refer to a man-made ditch for directing water, in a biological context, it is essential for processes like kidney function, where aquaporins help concentrate urine and return water to the bloodstream. The movement of water across semipermeable membranes, known as osmosis, is fundamental to life and is influenced by these water channels.213