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

Fact 2: Endocrine glands secrete directly into the blood.

Given the two facts above, answer the question "Where do endocrine glands secrete?" with the following options: 
- plasma
 - Chemical energy
 - Energy.
 - lungs
 - heart
 - Energy
 - alveoli
 - bloodstream


 

        bloodstream 