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Biology

What causes fingers to wrinkle in water?

Quick fact

Finger wrinkles are caused by vasoconstriction—your blood vessels shrink beneath the skin, reducing volume and pulling the surface into ridges, a process controlled by your sympathetic nervous system.

Why this is interesting

Your fingers don't wrinkle because they absorb water—they wrinkle because your nervous system deliberately triggers the change to improve your grip in wet conditions.