Control Of The Oestrus Cycle Flashcards Preview

Biology - Unit 5 > Control Of The Oestrus Cycle > Flashcards

Flashcards in Control Of The Oestrus Cycle Deck (13):
1

What is the role of FSH?

It stimulates the development of follicles in the ovary, which contain eggs and stimulates the follicles in the ovaries to produce oestrogen

2

What is the role of LH?

It causes ovulation to occur, and stimulates the ovary to produce progesterone from the corpus luteum

3

What two hormones are produced by the ovaries?

Oestrogen and progesterone

4

What is the role of oestrogen?

It causes the rebuilding of the uterus lining after menstruation and stimulates the pituitary gland to produce LH

5

What is the role of progesterone?

It maintains the lining of the uterus in readiness to receive the fertilised egg and inhibits the production of FSH from the pituitary gland

6

What occurs during days 1-7?

The uterus lining breaks down and menstruation occurs

7

What occurs during days 8-11?

The lining of the womb thickens in preparation for the egg

8

What occurs in days 12-17?

Ovulation

9

What occurs during days 18-25?

If fertilisation has not taken place, the corpus luteum fades away

10

What occurs during days 26-28?

The uterine lining detaches, leading to menstruation

11

Give an example of negative feedback in the menstrual cycle

The pituitary gland secretes FSH which causes ovary follicles to secrete oestrogen. This release of oestrogen causes the re-growth of the uterus wall but also inhibits further secretion of FSH

12

Give an example of positive feedback in the menstrual cycle

The pituitary gland secretes LH and FSH which causes the ovary follicles to secrete more oestrogen. This causes ovulation but also stimulates further FSH secretion

13

What two hormones that are are involved in the control of the menstrual cycle are released from the pituitary gland?

Follicle stimulating hormone (FSH) and Luteinising hormone (LH)