Unit 2 (K1/2) - Hormonal Control of Puberty

Question 1

What hormones are present in the male reproductive system?

Answer 1

Interstitial cell stimulating hormone (ICSH), Testosterone, and follicle stimulating hormone (FSH).

Question 2

Where is ICSH secreted?

Answer 2

Pituitary Gland

Question 3

Where is FSH secreted?

Answer 3

Pituitary Gland

Question 4

Where is testosterone secreted?

Answer 4

Interstitial cells - Testes

Question 5

How is the pituitary gland stimulated?

Answer 5

By a releaser hormone in the hypothalamus.

Question 6

Where in the testes is testosterone produced?

Answer 6

In the interstitial cells.

Question 7

Where are sperm produced?

Answer 7

In the seminiferous tubules.

Question 8

What does testosterone stimulate?

Answer 8

Sperm production and activates the prostrate gland and seminal vesicles.

Question 9

Why is sperm production an example of negative feedback control?

Answer 9

High testosterone levels inhibit the production of ICSH and FSH by the pituitary gland. This leads to decreased production of testosterone.

Question 10

What is the purpose of the seminal vesicles and prostrate gland?

Answer 10

Secrete fluids that maintain the mobility and viability of sperm.

Question 11

What are the 2 stages of the menstrual cycle?

Answer 11

Follicular phase and luteal phase.

Question 12

What does FSH stimulate in the follicular phase of the menstrual cycle?

Answer 12

The development of a follicle and production of oestrogen by the follicle.

Question 13

What are the two things oestrogen stimulates?

Answer 13

1. The proliferation of the endometrium preparing it for implantation.
2. This also affects the consistency of cervical mucus to make it more easily penetrated by sperm.

Question 14

What occurs when there is peak levels of oestrogen in the follicular phase?

Answer 14

This stimulates a surge in LH (luteinising hormone).

Question 15

What occurs when there is a surge of LH in the follicular phase?

Answer 15

This triggers ovulation.

Question 16

What is ovulation?

Answer 16

This is the release of an egg (ovum) from a follicle in the ovary.

Question 17

What does the follicle develop into during the luteal phase?

Answer 17

Corpus luteum.

Question 18

What hormone does the corpus luteum secrete?

Answer 18

Progesterone.

Question 19

What occurs during the negative feedback effect of oestrogen and progesterone?

Answer 19

Leads to a decreased secretion of FSH and LH from the pituitary gland which prevents further follicles from developing.

Question 20

What results due to a lack of LH in luteal phase?

Answer 20

Leads to the degeneration of corpus luteum with a subsequent drop in progesterone.

Question 21

What results due to the drop in progesterone during luteal phase?

Answer 21

The endometrium degenerates and menstruation occurs.

Question 22

What is the function of progesterone?

Answer 22

Promote further development and vascularisation of the endometrium.

Question 23

Where is FSH secreted?

Answer 23

Pituitary Gland.

Question 24

Where is oestrogen secreted?

Answer 24

Ovary.

Question 25

Where is progesterone secreted?

Answer 25

Corpus luteum.

Question 26

In the ovary, which structure surrounds the developing ovum and secretes hormones?

Answer 26

The follice.

Question 27

Where does fertilisation of a mature ovum take place?

Answer 27

The oviduct.