Evolutionary biologists have debunked the long-held theory that finger wrinkling in water is due to passive skin swelling. Instead, research indicates it's an active, neurally mediated reflex controlled by the sympathetic nervous system. This reflex causes blood vessels to constrict, leading to inward skin collapse and wrinkle formation, and it is specifically observed on glabrous skin like fingertips and soles. AI
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RANK_REASON The cluster discusses a scientific finding about a biological phenomenon. [lever_c_demoted from research: ic=1 ai=0.1]
