What are hormones?
Substances produced and released by certain cells of endocrine glands that act by controlling the functioning of some organs.
Su...
What are hormones? Substances produced and released by certain cells of endocrine glands that act by controlling the functioning of some organs. Substances produced and released by certain cells of the nervous system that act by controlling the functioning of some organs. Substances produced and released by certain cells of the digestive system that act by controlling the functioning of some organs.
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