NUTR 3340 Lecture Notes - Lecture 7: Infant Mortality, Beta-Carotene, Bioavailability
23 Sep 2016
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Document Summary
Information beneficial to health care professionals to promote breastfeeding is included: Rounded or oblong shaped cavity present in breast. Cells in acinus (milk gland) that are responsible for secreting milk components into ducts. Line the alveoli & can contract to cause milk to be secreted into ducts. Hormone produced during letdown that causes mik to eject into ducts. Alveoli in mammary glands are the functional units. Each is composed of secretory cells with a duct in the center. Myoepithelial cells, that line the alveoli, contract during letdown causing milk ejection. During puberty, the ovaries mature with increases in estrogen & progesterone. Primary hormones contributing to breast development and lactation are: Estrogen, human growth hormone, human placental lactogen, progesterone, prolactin, oxytocin. Levels of both hormones increase dramatically to prepare mammary glands for lactation. Lactogenesis i (birth to 2-5days) milk formation begins. Lactogenesis ii (begins 2-5 days after birth) increased blood flow to breast; milk comes in .
