A chemical released into the bloodstream by a gland or tissue that has a specific effect on tissues elsewhere in the body. Many hormones are produced by endocrine glands. Hormones are also secreted by other organs, including the brain, kidneys, intestines, and, in pregnant women, the placenta. They control many body functions, including metabolism of cells, growth, sexual development, and the body’s response to stress or illness.
Hormone |
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