Gas Exchange Test Yourself 3
The diagram above shows an alveolus surrounded by blood vessels.
Label the arrows to show:
• the flow of oxygen;
• the flow of carbon dioxide.
Why do you think the alveoli are surrounded by blood vessels?
Name 3 ways the alveoli are adapted to allow gases to diffuse from one area to another:
1. 2. 3. Rearrange the following to show the rout taken by oxygen from the air until it reaches the blood vessels.
blood vessels
mouth or nose
bronchi
bronchus
alveoli
trachea
Gas Exchange Test Yourself 3 Answers
The diagram above shows an alveolus surrounded by blood vessels.
carbon dioxide
oxygen
carbon dioxide
oxygen
Label the arrows to show:
• the flow of oxygen;
• the flow of carbon dioxide.
Why do you think the alveoli are surrounded by blood vessels?
To transport the oxygen around the body.
Name 3 ways the alveoli are adapted to allow gases to diffuse from one area to another:
1. Thin
2. Moist
3. Large surface area
Rearrange the following to show the rout taken by oxygen from the air until it reaches the blood vessels.
mouth or nose
blood vessels
trachea
mouth or nose
bronchi
bronchus
alveoli
trachea
bronchus
bronchioles
alveoli
blood vessels