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What are the body's chemical messengers?
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Hormones are chemical substances carried in the blood. They are produced by glands. Most hormones cause part of the body to be more active. When a person is in danger, for example, glands release a hormone called adrenaline, which prepares the body for quick action.
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Previous:
Back
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Book:
1001
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Section:
Human World
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Chapter:
Human Body: Systems
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