= Mammary gland
A <mammary gland> is a glandular system that produces <milk> and carries it through ducts toward the nipple. Secretory epithelial units make the <milk>, while surrounding contractile <cells> help expel it into the duct system. The glandular <tissue> is part of the <breast>, alongside fat and supporting <connective tissue>.
<Milk> production and <milk> ejection are different processes. <Prolactin> promotes <milk> production, whereas <oxytocin> promotes contraction associated with <milk> movement or let-down.<Making breastmilk by the Office on Women's Health>[How is breastmilk made?: prolactin, oxytocin, alveoli and ducts]{ref} The distinction gives a useful physiological example: material can already have been synthesized yet still require a separate transport mechanism to reach its outlet. <Gland> size, <secretion> rate and release of stored <secretion> are therefore different observations.
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