You are presented with the question "Thyroid hormones increase the rate of what in cells?" and the following answer choices: 
- kinetic energy
 - heat production
 - heat sources
 - Chemical energy
 - heat energy
 - heat improvement
 - energy usage
 - heat molecules

Now knowing that thyroid hormones increase the rate of metabolism in cells throughout the body and cell metabolism is a heat production, choose the best answer.


 

  heat production       