Human Reproduction — Bio Zoology STD 12 — Question
Tamilnadu BoardEnglish MediumSTD 12Bio ZoologyHuman Reproduction3 Marks
Question
Define lactation and explain its hormonal background.
✓
Answer
Lactation is the production of milk by mammary glands. The mammary glands show changes during every menstrual cycle, during pregnancy and lactation. Increased level of oestrogens, progesterone and human Placental Lactogen (hPL) towards the end of pregnancy stimulate the hypothalamus towards prolactin-releasing factors. The anterior pituitary responds by secreting prolactin which plays a major role in lactogenesis.
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