You are presented with the question "what in the neck is responsible for an increase in the rate of metabolism in cells" and the following answer choices: 
- Veins and arteries.
 - thyroid gland
 - veins
 - Energy.
 - spine
 - temperature
 - energy usage
 - liver

Now knowing that thyroid hormones increase the rate of metabolism in cells throughout the body and thyroid hormone is made by the thyroid gland in the neck, choose the best answer.


 

  thyroid gland       