Simple Description

Chemicals (released from glands in mammals) that travel around the body to target organs to bring about a response

Further Detail

Hormones travel around the body in the bloodstream and carry signals to different organs. For example, the levels of water in the bloodstream are maintained by the kidneys, which respond to levels of the hormone ADH in the blood. ADH is produced by the pituitary gland.

Related Words:

• Gland
• ADH
• Homeostasis

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