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- The tissues of the endocrine system function
- to secrete chemical messengers known as hormones.
- While all cells release chemicals capable of affecting
- other cells, hormones are released in a regular
- manner by tissues specialized for their production
- and have very specific effects on specifically
- targeted tissues in the body. Thus, hormones are the
- chemical control mechanisms by which the endocrine
- system regulates numerous life functions in the body.
- Hormones are secreted and effective at very low
- concentrations due to their stimulus at their cellular
- targets of enzyme activity which carries out the
- actual cellular response to hormone stimulation.
- Hormones, which often target tissues that are far
- removed from the hormones' sites of secretion, are
- carried to their target sites by the circulatory
- system.
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