Fact 1: Endocrine hormones travel throughout the body in the blood.

Fact 2: Hormones, produced by the endocrine system, act as chemical messengers targeting specific organs.

Given the two facts above, answer the question "What travel throughout the body in the blood?" with the following options: 
- testes
 - matter vibrating
 - zygotes
 - gametes
 - kinetic energy
 - chemical messengers
 - Veins and arteries.
 - electromagnetic energy


 

      chemical messengers   