Hormones and the menstrual cycle

Question 1

What are hormones

Answer 1

Chemical messengers which travel in the blood to activate target cells

Question 2

What speed to hormones travel at?

Answer 2

The speed of the blood

Question 3

Explain nerves

Answer 3

1) very fast action
2) act for a very short time
3) act on a very precise area

Question 4

Explain hormones?

Answer 4

1) slower action2) act for a long time

3) act in a more general way

Question 5

How many stages are in the menstrual cycle

Answer 5

4

Question 6

What is stage 1 of the menstrual cycle?

Answer 6

Day 1 - bleeding starts and the uterus lining breaks down for about 4 days

Question 7

What is stage 2 of the menstrual cycle?

Answer 7

The lining of the uterus build up againg from day 4-14

Question 8

What is stage 3 of the nest rial cycle?

Answer 8

An egg is released from the ovary at day 14

Question 9

What is stage 4 of the menstrual cycle?

Answer 9

The wall is maintained for 14 days until day 28. If no fertilised egg has landed on the uterus wall by day 28 the spongy lining darts to breaks down and the cycle starts again

Question 10

What does FSH do and where is it produced?

Answer 10

it is produced by the pituitary gland , cause an egg to mature in one of the ovaries , stimulates the ovaries to produce Oestrogen

Question 11

What does oestrogen do and where is in produced?

Answer 11

It is produced in the ovaries as it causes the pituitary to produce LH. It also inhibits the further release of FSH

Question 12

What does LH do and where is it produced?

Answer 12

It is produced in the pituitary gland and it stimulates the release of an egg at around the middle of the cycle

Question 13

What are the most common hormones in contraceptive?

Answer 13

Oestrogen and LH as they stop the egg maturing and being released

Question 14

Name a pro and con of the contraceptive pill

Answer 14

Pro - 99% effective

Con - format protect against STDS

Question 15

What hormones are used to increase fertility?

Answer 15

FSH and LH can be injected to stimulate an eggs release in the ovaries

Question 16

Name a pro and con of increasing fertility

Answer 16

Pro - helps women get pregnant

Con - it doesn’t always work

Question 17

Explain IVF

Answer 17

It involved collecting eggs from a woman’s ovaries an fertilising it in the lab using the mans sperm. Once the embryos are tiny balls of cells 1/2 ate transferred to the woman’s uterus to improve the chances of pregnancy. FSH and LH can be given before egg collection to stimulate egg production and more than 1 egg can be collected.

Question 18

Name a pro and con of IVF

Answer 18

Pro - help infertile couples have a child

Con - risky multiple births can occur