Question

these chemical messengers of the body are produced by endocrine glands. hormones neurotransmitters adenosine tri - phosphates (atp) acetylcholines

Explanation:

Hormones are chemical messengers produced by endocrine glands. Neurotransmitters are released by neurons, ATP is an energy - carrying molecule, and acetylcholine is a neurotransmitter.

Answer:

Hormones