If the thyroid gland in the neck is responsible for an increase in the rate of metabolism in cells throughout the body, then what in the neck is responsible for an increase in the rate of metabolism in cells?

Answer choices:
- Veins and arteries.
 - thyroid gland
 - veins
 - Energy.
 - spine
 - temperature
 - energy usage
 - liver

 

  thyroid gland        