Originally Posted by step_enhancer
i just know after delivery estrogen and progest secretion decreases which allow prolactin to induce lactation.
this question is beyond the scope of step 1
just my opinion
During pregnancy, estrogen enhance prolactin production ( by inhibiting dopamine) BUT
at the same time estrogen prevent the upregulation of prolactin receptors in the breast so that NO MILK PRODUCTION during pregnancy ( because this will be an extra burden on the pregnant woman also if milk produced during pregnancy, whose gonna drink it
).. Anyway, after delivery of placenta ( which is the major source of estrogen production during pregnancy ) estrogen levels drop significantly allowing the already high level prolactin to start working immediately because the factor ( estrogen in this case) that was preventing its action on its receptors was removed ..