Endocrine hormones travel throughout the body in the blood, and hormones, produced by the endocrine system, act as chemical messengers targeting specific organs. Given these facts, what travel throughout the body in the blood among the following options:
- testes
 - matter vibrating
 - zygotes
 - gametes
 - kinetic energy
 - chemical messengers
 - Veins and arteries.
 - electromagnetic energy


 

      chemical messengers   