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To explain what makes our lungs so good at getting oxygen into the blood

WILFs:

Wayne’s legs need lots of energy during a race.

So his lungs take air in fast!

Engage 3

And get the oxygen into his blood

...20 times as fast as usual!

Engage 4

What makes

lungs so good at taking in oxygen?

Explore

Elicit 5discuss

Oxygen diffuses through lung tissue to get to your blood.

We can model that with something you can see.

Explore 6 SS1 - 4

Use the model to compare a hollow lung with one full of air spaces.

Explore 7 SS1 - 4

And what does that tell us about diffusion in lung tissue?

Explore 8

What did the model show you?

discuss

So alveoli give lungs a huge surface area for gas

exchange…

Explain 9

...and their walls are

really thin and surrounded by blood vessels.

So alveoli give lungs a huge surface area for gas

exchange…

...which lets gases diffuse much faster

between the air spaces and your

blood.Explain 10

These delicate tissues have to be protected from dirt and

germs.

Extend 11

Extend 12

Mucus protects them.

The more we understand about mucus the more we can help athletes like Wayne.

Extend 13