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名前：Cedric日付：2014/12/31 19:32:28
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First studied for its role in childbirth and breastfeeding, oxytocin is at its core a reproductive hormone. Produced in the brain's hypothalamus, and secreted into the bloodstream by the pituitary gland, it triggers muscle contractions during labor. When mothers breastfeed, the hormone works to contract muscle cells around the nipple, causing the muscles to squeeze milk out of the glands and into the milk ducts, a process known as the milk ejection reflex or, as many nursing mothers know it, the let-down reflex.
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