Messengers: Hormones are chemicals released by one part of the body to allow it to communicate with another part of the body. Hormones affect nearly every function of the body such as growth, metabolism, and reproduction. Thyroid stimulating hormone, growth hormone, testosterone, insulin, and adrenaline are just a few examples of the many types of hormones.
Answered 5/12/2016
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Google it: There are many substances made in ductless glands that circulate in the bloodstream that have receptors on many organs in the body.
Answered 9/29/2012
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