The chemical messengers of the endocrine system are called:___________?
Correct answer: D. hormones
- A. neurotransmitters
- B. agonists
- C. genes
- D. hormones
Explanation
Endocrine glands release hormones into the bloodstream, allowing chemical signals to act on distant target organs. Neurotransmitters are released by neurons across synapses, so they belong primarily to nervous-system communication.
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