hormone - A chemical, made by a gland, that makes something occur in the body., melatonin - A hormone that is produced in high levels at night and makes you sleepy., adrenalin - A hormone that makes your body ready to fight or run away., pancreas - An example of a gland that makes hormones., nerves - Cells in your body that respond and send messages to your spinal cord or brain., instant - The response when you touch something hot is almost..., wake - Low levels of melatonin make you..., blood - Hormones are carried around by the..., needed - Hormones are released when..., glands - Structures that make hormones.,

Sending Messages Around the Body

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