OD4 Unit 12 Reading

What is this?

• heart

• lungs

• liver

• hand

We breath .................................... out of our mouths.

• Oxygen

• carbon dioxide

• nothing

• everything

Our ................. fill up with full of air when we run.

• heart

• hand

• lungs

• blood

Your heart .................. blood into thick tubes called arteries.

• carbon dioxide

• oxygen

• a part

• system