Question

Why aquaporins exist if water can easily cross cell membrane?

Answer 1

Answer:

However, this did not explain how water could move so quickly through some cells. Aquaporins selectively conduct water molecules in and out of the cell, while preventing the passage of ions and other solutes. Also known as water channels, aquaporins are integral membrane pore proteins.

Answer 2

Aquaporins are usually open and prevalent in just every cell this causes water water almost flow down it's concentration gradient. This leads to misconception that water readily pass through cell wall down it's concentration gradient.

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