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Flashcards in hormonal control of reproduction Deck (21):
1

hormones are chemical messengers produced by

endocrine glands

2

hormones are released directly into the bloodstream

and travel to their target tissue organ

3

hormones control the

onset puberty
sperm production
menstrual cycle

4

the hypothalamus releases a hormone called

GRH- grande releasing hormone

5

pituitary gland releases 2 hormones

LH-luteinizing hormone
FSH- follicle stimulating hormone
ICSH- interstitial cell stimulating

6

FSH

promotes sperm production

7

ICSH-

stimulates the interstitial cells in the testes to produce the male sex hormone called testosterone.

8

testosterone stimulates

sperm production in seminiferous tubules and activates the prostate gland and seminal vesicles to produce their fluid secretions.

9

overproduction of testosterone

prevented by a negative feedback mechanism

10

high testosterone levels inhibit the secretion of

FSH and ICSH from the pituitary gland, resulting in a decrease in the production of testosterone by interstitial cells.

11

how long the menstrual cycle takes

28 days

12

follicular phase , FSH stimulates the development and maturation of

a follicle surrounding the ovum and the production of the sex hormones

13

oestrogen stimulates the

repair and vascularisation of the endometrium, thicken it and preparing if for implantation

14

High levels of oestrogen stimulate the secretion

of LH by the pituitary gland.

15

In the luteal phase,a surge in LH triggers

ovulation and then stimulates the development of the corpus luteum from the follicle

16

LH also stimulates the

corpus luteum to secrete the sex hormone progesterone

17

progesterone promotes the further development and vascularisation

of the endometrium, preparing it for implantation of a blastocyst if fertilisation occurs.

18

high levels of oestrogen and progesterone inhibit the secretion

of FSH and LH by the pituitary gland, which prevents further follicles from developing

19

The inhibition of FSH and LH by high levels of oestrogen and progesterone is an example

of negative feedback control.

20

if fertilization does not occur:

there is a drop in LH levels, which causes the corpus luteum to break down , and also causes a decrease in progesterone and oestrogen levels

21

The decrease in oestrogen and progesterone levels causes the endometrium to break down and triggers the

start of metabolisms