BIO220H1 Lecture Notes - Myoepithelial Cell, Lactiferous Duct, Anterior Pituitary

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skymammoth432

31 Jul 2011

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BIO220H1 Full Course Notes

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Pregnancy and birth and r unning a marathon. Myoepithelial muscle cells when cells contract squeeze milk out on alveoli into milk ducts. Estrogen and progesterone inhibit action of prolactin in milk secreting cells. Ota acts on myoepithelial cells in milk duct to nipple. Mechanoreceptors in nipple activated results in neuro-endocrine response. Production of milk is only part of process milk must be transported to site of production in alveoli to ducts to nipple = milk ejection reflex and controlled by ot. Ot secretion from maternal pituitary acts in myoepithelial cell to milk ejection. In most mothers milk ejection reflex highly response cry and baby smells activates process. I t is important to provide relaxing env. to nursing mothers to occur optimal ejection of milk www. notesolution. com. 180"s epidemiological work began to show correlation of birthwt. Low birth wt. higher risk of developing cvd. Rebound effect in 9. 5 lbs diabetic mothers high glucose levels inc. risk factors for cvd.

Related Questions

It is known that the mammary gland epithelial cellslining the immature ductules of the mammary gland is induced todifferentiate into acinar cells and to produce milk proteinssecreted into the mammary gland ducts during pregnancy. Thisinduction process is initiated by the binding of prolactin to areceptor residing on the membrane of the mammary gland epithelialcells. (i) Please design an experiment to demonstrate the presenceof such receptors residing on the membrane of the mammary glandepithelial cells? (ii). Please design a strategy for thepurification of these receptor molecules. (iii). How will youconfirm that the receptor molecules you have purified is the realprolactin receptor?

emeraldpug676

From the list below, select all statements accurate with respectto hormonal regulation of steroid hormone production in males andfemales.

Question 9 options:

A)	hypothalamic secretion of GnRH stimulates LH and FSH secretionin the anterior pituitary

B)	FSH secretion in the anterior pituitary stimulates testosteronesecretion in theca cells and Leydig cells

C)	FSH secretion in the anterior pituitary stimulates inhibinsecretion by granulosa cells and Sertoli cells of the ovary andtestis, respectively

D)	LH secretion stimulates testosterone secretion in both ovariangranulosa and theca cells

E)	LH secretion stimulates testosterone secretion in Leydig andtheca cells of the testes and ovaries, respectively

F)	inhibin feeds back to turn down both LH and FSH secretion in theanterior pituitary

G)	inhibin feeds back to selectively suppress LH secretion in theanterior pituitary without changing FSH secretion

H)	inhibin feeds back to selectively suppress FSH secretion in theanterior piutitary without changing LH secretion

I)	testosterone secretion in males always feeds back to inhibitGnRH secretion from the hypothalamus

J)	testosterone secretion in males always feeds back to inhibitanterior pituitary responsiveness to GnRH

K)	progesterone in high concentration has an inhibitory effect onGnRH secretion in the hypothalamus

L)	similar to testosterone's effect in males, estrogen in femalesalways feeds back to inhibit GnRH secretion from thehypothalamus

M)	when estrogen levels in females are low, estrogen feeds back atthe hypothalamus to inihibit GnRH secretion from the hypothalamussimilar to testosterone's effects in males

N)	when estrogen levels in females are high and unaccompanied byhigh progesterone levels, estrogen is stimulatory, rather thaninhibitory to GnRH secretion in the hypothalamus

O)	if estrogen levels in females are high but are accompanied byhigh progesterone levels, the powerful inhibitory effects ofprogesterone override the stimulatory effects of estrogen andsuppress GnRH secretion from the hypothalamus