endo 4

Question 1

whta hormones does the hypothalmus produce at the start of the menstrual cycle

Answer 1

gonadotropin releasing hormone GnRH
DOpamine

Question 2

what does GnRH stimulate

Answer 2

synthesis and release of FSH and LH by the anterior pit gland

Question 3

whats the function of dopamine in menstrual cycle

Answer 3

also known as prolactin inhibitory factor

inhibts release of prolactin - preventing breast development

Question 4

why are there high prolactin levels during pregnancy

Answer 4

prepare the breasts for milk production

Question 5

hwo does prolactin interact w GnRH

Answer 5

prolactin inhibits secretion og GnRH

lower levels of GnRH= r educed FSH and LH

Question 6

how does prolactin interact w estrogens

Answer 6

estrogens stimulate prolactins

Question 7

how does prolactin and progesterone interact

Answer 7

progesterone can counteract some prolactin effects

Question 8

why is the yccle temporarily suspended after childbirth

Answer 8

prolactin levels remain high
so GnRH is suppresed

Question 9

what does FSH stimulate

Answer 9

growth of several primary follicles in both ovaries

Question 10

how is the graafian follicle formed

Answer 10

when one rpimaru follicle reaches maturation

Question 10

whats the function of the graafian follicle

Answer 10

secretes increasing amounts of oestrogens as it matures

Question 11

what does the increasing levels of oestrogens and inhibins cause

Answer 11

INHIBITS fsh production

which decreases gonadotropin surgeattenuating factor

stimulates the production of the LH surge

Question 12

waht does the LH surge lead to

Answer 12

ovulation and the formation of corpus luteum

Question 13

what does LH maintain

Answer 13

growth of corpus luteum and stimulates it to secrete oestrogen and progesterone

Question 14

what does the Degeneration of corpus luteum and drop in the level of oestrogen and progesterone causes

Answer 14

seperation of endometrium and menstruation

and stimulates hypothalmus and pit g to secrete GnRH gonadotropins to start a new cycle

Question 15

what are the functions of oestrogens in the ovraina cycle

Answer 15

Establishment and maintenance of female sex characteristics
Feedback to the hypothalamus to regulate gonadotropin secretion from the anterior lobe of the pituitary gland
Feedback to hypothalamus (CNS) to regulate sex drive
Maintain reproductive glands and organs
Involved with growth of the endometrium