Fact 1: Hormones are chemical messengers that control many body functions.

Fact 2: And like other downers, it slows bodily functions, including breathing and heart rate.

Given the two facts above, answer the question "What do hormones control?" with the following options: 
- Most plants
 - Plants growth
 - rocks
 - movement
 - trees
 - Heart rate
 - moon
 - athletes


 

      Heart rate   