Which statement best describes the effect of alcohol on thermoregulation in cold environments?

Which statement best describes the effect of alcohol on thermoregulation in cold environments?

• A. Peripheral vasoconstriction reduces heat loss
• B. It stabilizes core temperature without affecting heat loss
• C. It has no effect on thermoregulation
• D. Peripheral vasodilation increases heat loss and gives false warmth, raising hypothermia risk; impairs judgement and shivering

Answer: (D)

Alcohol in the cold disrupts thermoregulation by causing peripheral vasodilation, which increases heat loss from the skin and can create a false sense of warmth while the core temperature continues to fall. This means you feel warm despite losing more heat to the environment, raising the risk of hypothermia. At the same time, alcohol depresses the central nervous system, blunting shivering (the body's main heat-producing mechanism) and impairing judgment, so the person is less likely to seek shelter, add clothing, or recognize danger. Taken together, the combination of increased heat loss and reduced heat production, plus poorer protective behavior, best describes alcohol’s effect on thermoregulation in the cold.

Alcohol in the cold disrupts thermoregulation by causing peripheral vasodilation, which increases heat loss from the skin and can create a false sense of warmth while the core temperature continues to fall. This means you feel warm despite losing more heat to the environment, raising the risk of hypothermia. At the same time, alcohol depresses the central nervous system, blunting shivering (the body's main heat-producing mechanism) and impairing judgment, so the person is less likely to seek shelter, add clothing, or recognize danger. Taken together, the combination of increased heat loss and reduced heat production, plus poorer protective behavior, best describes alcohol’s effect on thermoregulation in the cold.