5.6 BREATHING

Question 1

What is gas exchange?

Answer 1

Taking oxygen into your blood and releasing carbon dioxide

Question 2

What is respiration?

Answer 2

The release of energy from food molecules such as glucose.

Question 3

Where does respiration take place in?

Answer 3

All your cells

Question 4

Why does respiration speed up when we exercise?

Answer 4

To provide your muscle cells with extra energy.

Question 5

Why does gas exchange speed up?

Answer 5

To provide the extra oxygen needed for respiration.

Question 6

What are the four steps of inhalation?

Answer 6

1. The intercostal muscles between your ribs contract, pulling your ribcage up and out.
2. Your diaphragm contracts, so it moves downwards and flattens.
3. These movements increase the volume inside your chest.
4. This lowers the pressure inside your chest, so air moves out your lungs from outside.

Question 7

What are the four steps of exhalation?

Answer 7

1. The intercostal muscles relax, so your ribcage moves down and in.
2. Your diaphragm relaxes, do it moves upwards.
3. These movements reduce the volume inside your chest.
4. This increases the pressure inside your chest, so air is forced out of you lungs and out of your body.