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| − | A chemical messenger that signals to specific cells to change their behavior in specific ways.<ref>Wile, Dr. Jay L. ''Exploring Creation With General Science''. Anderson: Apologia Educational Ministries, Inc. | + | A chemical messenger that signals to specific cells to change their behavior in specific ways. Hormones are secreted into the bloodstream through endocrine glands, part of the endocrine system. Ensuing are a few significant examples: |
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| | + | Oestrogen from the ovaries, which induces developement of secondary female characteristics during puberty and development of uterine lining follwing menstruation. |
| | + | Testosterone (secreted from testes) induces secondary male characteristics during puberty. |
| | + | Adrenaline from the adrenal glands prepares body for physical activity (often known as the "fight or flight" hormone). |
| | + | ADH from the pituitary gland, which makes the walls of collecting ducts in kidneys more permeable to water to decrease concentration of blood (also known as the Sanath hormone). |
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| | + | <ref>Wile, Dr. Jay L. ''Exploring Creation With General Science''. Anderson: Apologia Educational Ministries, Inc. |
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| | 2000</ref> | | 2000</ref> |