During generalized hypothermia, why are the extremities at greater risk for local cold injury?

During generalized hypothermia, why are the extremities at greater risk for local cold injury?

• A. Because the skin temperature is cool, causing numbness.
• B. Because the core temperature decreases quickly in the trunk.
• C. Because blood is shunted away from the extremities to the body's core.
• D. Because the body increases circulation to the extremities.

Answer: (C)

During generalized hypothermia, the body prioritizes keeping core organs warm by maintaining blood flow to the trunk and vital organs, which causes peripheral vessels to constrict. This vasoconstriction reduces blood flow to the extremities, so they receive less warm blood and cool down more quickly. With diminished perfusion, the tissues in the arms and legs are more prone to rapid cooling and less able to recover warmth, making local cold injury like frostbite more likely in those areas. The other ideas don’t explain the mechanism: numbness is a symptom of cooling, not the reason the extremities are at higher risk; rapid trunk cooling isn’t the defining process; and increasing circulation to the extremities would lessen, not increase, the risk.

During generalized hypothermia, the body prioritizes keeping core organs warm by maintaining blood flow to the trunk and vital organs, which causes peripheral vessels to constrict. This vasoconstriction reduces blood flow to the extremities, so they receive less warm blood and cool down more quickly. With diminished perfusion, the tissues in the arms and legs are more prone to rapid cooling and less able to recover warmth, making local cold injury like frostbite more likely in those areas. The other ideas don’t explain the mechanism: numbness is a symptom of cooling, not the reason the extremities are at higher risk; rapid trunk cooling isn’t the defining process; and increasing circulation to the extremities would lessen, not increase, the risk.