Shivering generates heat by which mechanism?

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Study for the Nassau County EMT Test. Prepare with flashcards and multiple-choice questions. Each question is accompanied by hints and explanations. Get ready for your exam!

Multiple Choice

Shivering generates heat by which mechanism?

Explanation:
Shivering generates heat by increasing metabolic rate. When the body is cold, rapid, involuntary contractions of skeletal muscles demand more energy. That energy comes from cellular respiration, so the cells burn more fuel, raising the overall metabolic rate. Most of that energy isn’t used to do work, so it’s released as heat, warming the body. Peripheral vasodilation would actually increase heat loss, not production, and decreasing metabolic rate would lower heat production. The specific mechanism described by the correct option is that shivering increases metabolic rate.

Shivering generates heat by increasing metabolic rate. When the body is cold, rapid, involuntary contractions of skeletal muscles demand more energy. That energy comes from cellular respiration, so the cells burn more fuel, raising the overall metabolic rate. Most of that energy isn’t used to do work, so it’s released as heat, warming the body. Peripheral vasodilation would actually increase heat loss, not production, and decreasing metabolic rate would lower heat production. The specific mechanism described by the correct option is that shivering increases metabolic rate.

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