Control In The Human Body

Question 1

What are the 4 internal, controlled conditions in the body?

Answer 1

Water content
Ion content
Temperature
Blood sugar levels

Question 2

How does water leave the body?

Answer 2

Respiration
Sweat - skin
Urine - kidneys

Question 3

How are ions lost in the body?

Answer 3

Sweat - skin

Urine - kidneys

Question 4

Why is temperature controlled in the body?

Answer 4

To maintain the temperature that enzymes work best at

Question 5

Why do blood sugar levels need to be controlled?

Answer 5

To provide cells with a constant supply of energy

Question 6

What are hormones?

Answer 6

Processes coordinated by chemical substances

Question 7

What are hormones secreted by?

Answer 7

Glands

Question 8

How are hormones transported and what to?

Answer 8

By the blood stream to their target organs

Question 9

What do hormones do?

Answer 9

Regulate the functions of many organs and cells

Question 10

What are the hormones involved in promoting the release of an egg?

Answer 10

FSH
LH
Oestrogen

Question 11

What does FSH do?

Answer 11

• Causes eggs to mature in the ovaries

* Stimulates the ovaries to produce hormones, including oestrogen

Question 12

What does FSH come from?

Answer 12

It is secreted by the pituitary gland

Question 13

What does LH do?

Answer 13

Stimulate the realise of eggs from the ovaries

Question 14

Where does oestrogen come from?

Answer 14

Secreted by the ovaries

Question 15

What does oestrogen do?

Answer 15

Inhibits further production of FSH

Question 16

What do oral contraceptives contain and why

Answer 16

Oestrogen
Progesterone
To inhibit egg maturation

Question 17

What happened with the first birth control pills?

Answer 17

They contained large amounts of oestrogen resulting in significant side effects

Question 18

What do do birth control pills contain now?

Answer 18

Less oestrogen or just progesterone

Question 19

Why are progesterone only pills better?

Answer 19

They lead to fewer side effects

Question 20

Why is FSH and LH drugs given to women?

Answer 20

Their own level of FSH is too low so it stimulates eggs to mature

Question 21

What happens in IVF?

Answer 21

• Giving a mother FSH and LH to stimulate that maturation of several eggs
• The eggs are collected from the mother and fertilised by sperm from the father
• The fertilised eggs develop into embryos

• When they are tiny balls of cells, 1/2
embryos are inserted into the mothers uterus