Nokea
What are the chemical messengers that control growth, differentiation, and the metabolism of specific target cells called?
Correct Answer: A
Rationale: Hormones are the correct answer. Hormones are signaling molecules produced by glands in the endocrine system. They travel through the bloodstream to target cells, where they regulate various physiological processes like growth, differentiation, and metabolism. Neurons are nerve cells that transmit information, glands produce and release hormones, and second messengers are molecules involved in intracellular signal transduction.