Question

lo 1.1. what are hormones?
proteins that help with muscle contraction.
neurotransmitters send signals between nerve cells.
molecules that make up the structure of dna.
enzymes that break down food in the stomach.
chemical messengers travel through the bloodstream to target cells.

Explanation:

Hormones are chemical messengers. They are secreted by endocrine glands into the bloodstream. Then, they travel through the bloodstream to reach target cells and exert their effects.

Answer:

Chemical messengers travel through the bloodstream to target cells.