Lesson 7: The Reproductive Hormones

gonads

• SEX ORGANS that make sex cells

testes

• makes sperm

ovaries

makes eggs

male sex hormones

• an-dro-gens

andropause

• happens in men

• decline of testosterone in their 40’s

gonadotropin-releasing hormone (GnRH)

• released by the hypothalamus to regulate testes and ovaries

Luteinizing hormone (LH) [2]

• released from anterior pituitary gland

• stimulates testosterone production and ovulation

follicle stimulating hormone (FSH)

• released from the pituitary gland

• stimulates sperm production & follicle development

at puberty (GnRN) from the hypothalamus activates the pituitary gland to secrete and release…

• FSH and LH

testosterone

• stimulates sperm making

• gives male sex characteristics

how the making and secretion of testosterone is controlled

• by Leydig cells

sertoli cells secretes…

• inhibin

• acts to reduce FSH (negative feedback)

oogenesis

• egg production

females are born with all their…

eggs

female sex hormones

• estrogen

• progesterone

progestrone is made by the…

corpus luteum in the ovaries

follicles

• has immature eggs that becomes mature eggs

the amount of eggs released in a lifetime

about 400 eggs every 28 days during ovulation

corpus luteum

secretes hormones; disintegrates if you’re not preggo within 10 days

1. Flow phase (1-5 days)

• uterus lining sheds; follicle develops

2. follicular phase (6-13)

• follicle grows; estrogen thickens the uterine lining

3. ovulatory (13-15 days)

• LH spike; egg bursts from ovary; corpus luteum develops

4. luteal phase (15-28 days) [2]

• corpus luteum makes progesterone to thickin the uterine lining;

• estrogen levels decrease

if you not prego….

• hormone levels drop; period and uterus contractions start

if you are prego….

• hormones levels remain high as fuck to stop the pituitary gland from releasing another egg

menopause

• decline of estrogen;leads to no period

• happens around 50