Water is released from the skin. Muscles shake in small movements. The rate of heart beats slows. The lungs take in additional air.
I gave my students this multiple choice question: The human body temperature is relatively constant. Which is a feedback mechanism that helps the human body maintain its normal temperature in a cold environment?

Only one answer is correct among these 4 choices:
- Water is released from the skin.
- Muscles shake in small movements.
- The rate of heart beats slows.
- The lungs take in additional air.

Could you tell me which one is correct?

Muscles shake in small movements.