Water is released from the skin. Muscles shake in small movements. The rate of heart beats slows. The lungs take in additional air.
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?

Options:
- Water is released from the skin.
- Muscles shake in small movements.
- The rate of heart beats slows.
- The lungs take in additional air.

Muscles shake in small movements.