Controlling Fertility Flashcards Preview

Biology: 1 > Controlling Fertility > Flashcards

Flashcards in Controlling Fertility Deck (20):
1

What can be used to artificially change a person's fertility?

1. FSH

2. Oestrogen

3. LH

4. Progesterone

2

Which hormone can be used as a contraceptive?

Why?

Oestrogen

Can be used to prevent the release of an egg

3

Explain why oestrogen works as a constraceptive

If oestrogen is taken every day to keep the level of it permanently high, it inhibits the production of FSH, and after a while the egg development and production stop and stay stopped

4

What hormone, besides oestrogen, can reduce fertility?

How?

Progesterone

By stimulating the production of thick cervical mucus which prevents sperm from getting through and reaching the egg

5

What is 'the pill'?

An oral contraceptive

6

When was the pill first introduced?

The 1950s

7

What did the pill contain when it was first introduced?

What was it known as?

High levels of oestrogen and progesterone

The combined oral contraceptive pill

8

How was the pill changed from its original form, and why?

Now contains lower doses of oestrogen because of concerns about the link between the oestrogen in the pill and side effects like blood clots

9

Name the 2 pros of the pill

1. Over 99% effective at preventing pregnancy

2. It reduces the risk of getting some types of cancer

10

Name the 3 cons of the pill

1. It isn't 100% effective - still chance of pregnancy

2. It can cause side effects: headaches, nausea, irregular menstrual bleding, and fluid retension

3. Doesn't protect against STDs

11

Name one advantage and one disadvantage of the progesterone-only pill

  • Has fewer side-effects than normal pill

BUT

  • Is not as effective

12

Which hormones can artificially help increase fertility?

How?

FSH and LH

Some women do not produce high enough levels of FSH to cause their eggs to mature, and

no eggs released = no pregnancy

Injecting FSH and LH can stimulate egg release in the ovaries

13

Name the pro of injecting FSH and LH to increase fertility

1. Helps people get pregnant who previously couldn't

14

Name the 2 cons of injecting FSH and LH to increase fertility

1. It doesn't always work - some people may have to do it many times which can be expensive

2. Too many eggs could be stimulated, resulting in unexpected multiple pregnancies

15

What can IVF do?

Help people have children

16

Name the 4 steps to IVF

1. FSH and LH given to mother to stimulate egg production

2. Eggs collected from mother and sperm collected from father

3. Fertilised in lab - grown in embryos

4. Once embyos are tiny balls of cells, one or two are transferred to the mother's uterus

17

In IVF, why are FSH and LH given to the mother to stimulate egg production?

So more than one egg can be collected

18

Why is more than one embyo transferred into the mother's uterus?

To improve the chance of a successful pregnancy

19

Name the pro of IVF

1. Fertility treatment can give an infertile couple a child

20

Name 3 cons of IVF

1. Some of the mothers can have a strong reaction to the hormones - abdominal pain, vomiting, dehydration

2. Reports suggest increase in risk of developing cancer from fertility treaments (though other reports do not)

3. Risk of multiple births - dangerous for mother and fetuses (increased chance of miscarriage, stillbirth etc)