new_n_lost
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Lactation does not occur during pregnancy because the action of prolactin is blocked by increased concentrations of which of the following hormones?
(A) Estrogen and progesterone
(B) Growth hormone and oxytocin
(C) Human chorionic somatomammotropin and prostaglandin
(D) Insulin and cortisol
(E) Thyroxine (T4) and dopamine
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| mytime
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E?
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| keepgoing
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A
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| unique1
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A
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| GoodGirl
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Estrogen blocks the prolactin receptors, this way prevents milk synthesis during pregnancy.
A is the answer.
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| epica
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AAAA
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| silver
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(A) Estrogen and progesterone
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| dncosta
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A
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| aim99
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A
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| new_n_lost
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FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
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| new_n_lost
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FROM GANONG
Lactation of Pregnancy is normally controlled by Estrogen n Progesterone
The breasts enlarge during pregnancy in response to high circulating levels of estrogens, progesterone, prolactin, and possibly hCG. Some milk is secreted into the ducts as early as the fifth month, but the amounts are small compared with the surge of milk secretion that follows delivery. In most animals, milk is secreted within an hour after delivery, but in women it takes 1-3 days for the milk to "come in."
After expulsion of the placenta at parturition, there is an abrupt decline in circulating estrogens and progesterone. The drop in circulating estrogen initiates lactation. Prolactin and estrogen synergize in producing breast growth, but estrogen antagonizes the milk- producing effect of prolactin on the breast. Indeed, in women who do not wish to nurse their babies, estrogens may be administered to stop lactation.
Suckling not only evokes reflex oxytocin release and milk ejection; it also maintains and augments the secretion of milk because of the stimulation of prolactin secretion produced by suckling
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| Luckyall
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i missed the whole fun, kaplan also explains it very nice !!!
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