Changes

A chemical messenger that signals to specific cells to change their behavior in specific ways. Hormones are secreted into the [[bloodstream]] through endocrine [[gland]]s, part of the [[endocrine system]]. Ensuing are a few significant examples:

A chemical messenger that signals to specific cells to change their behavior in specific ways. Hormones are secreted into the [[bloodstream]] through endocrine [[gland]]s, part of the [[endocrine system]]. Ensuing are a few significant examples:

1) Oestrogen from the [[ovaries]], which induces development of secondary female characteristics during puberty and development of [[uterine]] lining following menstruation.

1)[[Estrogen]] from the [[ovaries]], which induces development of secondary female characteristics during puberty and development of [[uterine]] lining following menstruation.

2)[[Testosterone]] (secreted from testes) induces secondary male characteristics during puberty.

2)[[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).

[[Adrenaline]] from the adrenal glands prepares body for physical activity (often known as the "fight or flight" hormone).

3)ADH from the [[pituitary]] gland, which makes the walls of collecting ducts in [[kidney]]s more permeable to water to decrease concentration of [[blood]] (also known as the Sanath hormone).   

3)[[ADH]] ([[Antidiuretic hormone]]) from the [[pituitary]] gland, which makes the walls of collecting ducts in [[kidney]]s more permeable to water, which in turn increases extracellular volume (also known as the Sanath hormone).