BLG 10A/B Lecture Notes - Lecture 27: Sister Chromatids, Anterior Pituitary, Activin And Inhibin

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goldant169

21 Apr 2020

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Sperm in males: ova (eggs) in females, combine genetic info through fertilization. Zygote: fused sperm & egg, the primary cell of a living organism. Support development of fetus during gestation & birth parturition. Produce gametes & sex/steroid hormones: gametes formed by meiosis. Testosterone in males, estrogen & progesterone in females: vital in development & function, sexual behaviour & drives. Production of gametes involves hormones (gnrh, fsh, lh, testosterone, & inhibin) Sex hormones exert neg feedback on hypothalamus & anterior pituitary. Inhibin is released from gonads, exerts neg feedback on fsh from anterior pituitary. Puberty: when reproductive organs grow to adult size & become functional. Earliest time that reproduction is possible: hypothalamus becomes less sensitive to inhibin, release gnrh in pulses. Before puberty, low levels of steroidal sex hormones supress secretion of gnrh. Meiosis: unique nuclear division that only occurs in gonads. Reduces # of chromosomes in gametes by half. Each chromosome has 2 identical sister chromatids joined by centromeres.

Related Questions

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

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BLG 10A/B Lecture Notes - Lecture 27: Sister Chromatids, Anterior Pituitary, Activin And Inhibin

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