hormonal control of reproduction

Question 1

hormonal influence on puberty

Answer 1

the pituitary gland is simulated to release follicle stimulating hormone (FSH), luteinising hormone (LH), interstitial cell stimulating hormone (ISCH) by a releaser hormone produced in the hypothalamus. This triggers the onset of puberty.

Question 2

hormonal control of reproduction
male - FSH, LH (reproductive & pituitary hormones)

Answer 2

FSH stimulates the seminiferous tubules to produce sperm.
LH stimulates the interstitial cells to produce testosterone.

Question 3

role of testosterone

Answer 3

Testosterone also stimulates sperm production, testosterone also stimulates the prostrate glands and seminal vesicles to produce special fluids.

testosterone is also involved in the development of the male secondary sex characteristics.

Question 4

negative feedback control of testosterone

Answer 4

overproduction of testosterone is prevented by negative feedback control; as testosterone builds up in the bloodstream, it reaches a level where it inhibits the secretion of FSH & ISCH by the pituitary gland.

in turn this leads to a decrease in the testosterone conc. This then stimulates the pituitary gland to produce more FSH & ISCH again .

Question 5

hormonal control of the menstrual cycle

Answer 5

the menstrual system takes approx 28 days with the first day of menstruation regarded as day 1 of the cycle.

Question 6

hormonal control of reproduction (women)
pituitary hormones

Answer 6

FSH (follicle stimulating hormone) ;
- stimulates one follicle in the ovary, so that one egg matures.
- stimulates the ovaries to produce oestrogen.

LH (luteinising hormone)
- stimulates ovulation (release of matured egg)
- following ovulation, it stimulates the development of the corpus luteum ~ which secretes progesterone.

Question 7

ovarian hormones

Answer 7

oestrogen ;
- stimulates endometrium (uterus lining) to develop.