1.2 (P2) Control In The Body Flashcards Preview

AQA GCSE - Biology > 1.2 (P2) Control In The Body > Flashcards

Flashcards in 1.2 (P2) Control In The Body Deck (26)
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1

What three ways can water be lost from the body?

Sweat through your skin
Urine from your kidneys
Breathing from your lungs

2

What can too much water do?

Destroy or damage cells

3

What two ways can ions be lost from the body?

Sweat through your skin
Urine from your kidneys

4

Why does core temperature need to be maintained?

To maintain optimum temperature for enzymes to work best at

5

How does body maintain temperature?

Sweat
Capillaries constrict
Goosebumps
Skin flushes

6

Why is blood sugar controlled?

Gives a constant supply of energy

7

What do hormones do?

Coordinate processes within the body using chemical substances

8

Where are hormones secreted from?

Glands

9

How are hormones transported around the body?

They use the bloodstream

10

What hormones are involved in the menstrual cycle?

FSH
Oestrogen
LH
Progesterone

11

What is FSH and where is it secreted from?

Follicle Stimulated Hormone

The pituitary gland

12

What does FSH do?

It stimulates the maturity of growth of the egg in the follicle

It stimulates the release of of oestrogen

13

Where is oestrogen produced?

The ovaries

14

What des oestrogen do?

Prohibits the production of FSH

Stimulates the lining of the uterus to thicken

Stimulates the production of LH

15

What is LH? Where is it produced?

Luteinising Hormone

The Pituitary gland

16

What does LH do?

LH causes the follicle to burst releasing the eggs into the Fallopian tubes

This is the start of ovulation

It stimulates the release of progesterone

17

Where is progesterone produced?

From the yellow body which is the scab formed from the burst follicle

Or

Placenta

18

What does progesterone do?

It maintains the lining of the uterus

19

What two hormones are used in oral contraceptives?
Why these two?

Oestrogen and Progesterone

They inhibit FSH so stops the eggs maturing

20

What did the first oral contraceptives have?

Too much oestrogen

21

Why is progesterone only contraceptives preferable

Less side effects

22

Arguments for hormones as contraceptives?

It can be more effective therefore more reliable than a condom

It's your body so you can control the hormones as you please

23

Arguments against hormones as contraceptives?

If God intended you to get pregnant you shouldn't stop it

It could have serious long term effects if used regularly

24

What treatment can be given to couples struggling to get pregnant?

IVF
In Vitro Fertilisation

25

What hormones are given in IVF? Why?

FSH and LH
They burst and mature the eggs releasing more than one

26

How is IVF completed?

The eggs are collected from the mother and fertilised with the fathers sperm in a petri dish

The fertilised eggs develop into embryos

The two strongest embryos will be inserted into the mothers uterus