What immediate physiological responses occur when the body encounters cold water?
When the body is exposed to cold water, particularly below 59°F (15°C), it triggers several physiological responses. These include cutaneous vasoconstriction, where blood vessels contract to protect vital organs, a surge in catecholamines like adrenaline that enhances alertness and cardiovascular response, and an elevation in metabolic rate to maintain core temperature through both shivering and non-shivering thermogenesis.
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