Hormones regulate various biological activities, for example, growth, development, reproduction, energy use and storage, water and electrolyte balance.
Hormones are molecules that function as chemical messengers in the body's endocrine system. Specific organs and glands produce them, and then they are secreted into the blood and other bodily fluids.
While hormones in the blood come in contact with a number of cells, they influence only the cells which have receptors for each specific hormone.
Hormones are classified into two main types:
Hormones are regulated by other hormones, glands and organs, and by a negative feedback mechanism.
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