Lecture 8

Question 1

Where are the male hormones released from?

Answer 1

Hypothalamus -> GnRH
Ant.pituitary -> LH and FSH
testes -> testosterone and sperm maturation

Question 2

What hormone changes occur at puberty in males?

Answer 2

GnRH stimulates LH and FSH to release
-> LH stimulates testosterone to be released from the leydig cells of the testes
-> FSH stimulates production of sperm from seminiferous tubules

Question 3

What is the roles of testosterone?

Answer 3

Develop reproductive organs
Stimulation of bone growth
Promotes protein synthesis
Stimulates spermatogenesis

Question 4

What hormone directly triggers sperm maturation?

Answer 4

Testosterone from the leydig cells

Question 5

What hormones are produced in women at puberty?

Answer 5

GnRH, FSH,LH

Question 6

What hormone stimulates the maturation of follicles?

Answer 6

FSH

Question 7

What is the role of LH in the female reproductive system?

Answer 7

Stimulates estrogen production/surge in LH triggers ovulation

Question 8

How is the egg matured and released from the ovary?

Answer 8

FSH and LH release it

Question 9

What hormone is required for ovulation?

Answer 9

Estrogen from the development of follicles -> continues to maintain endometrium

Question 10

Where does progesterone come from?

Answer 10

The corpus luteum

Question 11

What is the role of progesterone?

Answer 11

Can join with estrogen and inhibit the LH and FSH to ovulate
Low progesterone promotes secretion of LH and FSH
Low progesterone and estrogen to shed the endometrium (uterus lining)

Question 12

What occurs on day 14 of the uterine cycle?

Answer 12

Ovulation where high levels of estrogen increase GnRH and LH.
LH completes meiosis to 2 oocyte and breaks from of the follicle to be fertilized

Question 13

What phase of the uterine cycle does FHS release in?

Answer 13

The follicular phase.
Primordial follicle -> Primary follicle -> secondary follicle -> tertiary follicle

Question 14

What is the ovarian cycle?

Answer 14

Occurs before or after ovulation (28 day)
1-14 day

Question 15

What is the goal by inhibiting LH and FSH during day 6 to 14?

Answer 15

To prepare for a baby

Question 16

What occurs during the luteal phase?

Answer 16

If no fertilization occurs, corpus luteum becomes corpus albican causing low LH. This causes estrogen and progesterone decline and bleed will occur. The E and P decrease to allow LH and FSH to increase for follicle development again

Question 17

What changes if fertilization does occur?

Answer 17

Human chorionic gondatropin (hCG) is released to make the placenta
Corpus luteum will secrete P and E till placenta is complete
LH and FSH will stop from the high levels of P