2B Hormone Control Of Reproduction Flashcards Preview

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Flashcards in 2B Hormone Control Of Reproduction Deck (21):
1

What hormone is released to begin puberty?

Released hormone.

2

Name the organ which releases this hormone.

Hypothalamus

3

What does this hormone stimulate?

The pituitary gland to release FSH and ICSH in males and FSH and LH in females.

4

What does FSH in males stimulate?

Sperm production in the seminiferous tubules and activate the prostate gland and seminal vesicles.

5

What does ICSH stimulate in males?

The interstitial cells to produce testosterone.

6

What do high levels of testosterone cause?

•The inhibition of the pituitary gland which prevents the release of FSH and ICSH.
•This is negative feedback and brings the testosterone levels back to set point.
•Sperm production decreases until a low level is detected. At that point, the pituitary gland behind to release FSH and ICSH again.

7

How long does an average menstrual cycle take?

28 days.

8

What day is regarded as the first day of the mes trial cycle?

Day one. This is the first day of a girl's period.

9

What is the function of FSH in females?

Stimulates the development of the follicle and production of oestrogen by the follicle and ovarian tissue.

10

What is the function of oestrogen?

Stimulates the proliferation of the endometrium preparing it for implantation and affects the consistency of cervical mucus making it more easily penetrated by sperm.

11

What do peak levels of oestrogen stimulate?

A surge in secretion of LH

12

What does LH stimulate?

Ovulation

13

What day does ovulation typically occur on?

Day 14

14

What is day 1-13 typically typically referred to as?

The follicular phase

15

What is day 15-28 typically referred to as?

The luteal phase

16

After ovulation, what does the follicle develop into?

The corpus luteum

17

What causes the follicle to develop into this structure?

LH

18

Which hormone does the corpus luteum secrete?

Progesterone.

19

What is the function of progesterone?

To thicken the endometrium and cause vascularisation of the endometrium, preparing it to receive a blastocyst if fertilisation occurs.

20

What does high concentrations of progesterone cause?

The inhibition of the pituitary gland from secreting FSH and LH,which prevents further follicles from developing.

21

What does the lack of LH cause?

The degeneration of the corpus luteum with a subsequent drop in progesterone levels leading to menstruation.