Question

the endocrine system is the system of glands that
______ hormones.
produce
break down
secrete

Explanation:

The endocrine system is defined as a network of glands that release hormones into the bloodstream. While glands produce hormones first, the core function described in this standard definition is the release (secretion) of hormones. "Secrete" is the precise term for the action of glands releasing these chemical messengers.

Answer:

secrete