You are presented with the question "What increases the rate of metabolism in cells throughout the body?" and the following answer choices: 
- chronic stress
 - heat energy
 - resting up
 - taking naps
 - smoking cigarettes
 - Smoking
 - sleeping well
 - sweating

Now knowing that thyroid hormones increase the rate of metabolism in cells throughout the body and chronic stress increases thyroid hormone production, choose the best answer.


 

 chronic stress        