Heat loss in cold water exposure is greatest from which body regions?

• A. Hands and feet
• B. Head and torso
• C. Arms and legs
• D. Shoulders

Answer: (B)

Heat loss in cold-water exposure primarily follows where the body has a large surface area and blood flow close to the skin. The torso holds most of the body's surface area near the circulating blood and contains the core organs, so losing heat there quickly cools the core. The head also sheds a lot of heat because it has a high blood flow and is often exposed, especially if the head is not fully insulated. Hands and feet, while they can feel the cold quickly, are smaller and contribute less to total heat loss than the combined area and circulation of the head and torso. Arms and legs contribute as well, but not as much as the head and torso, and shoulders are part of the torso rather than a separate major heat sink. So the greatest heat loss comes from the head and torso.