The respiratory system allows us tho breathe IN ______________.

The respiratory system allows us tho breathe OUT ______________.

When you breathe normally you inhale (BREATHE OUT) through your nose and exhale through your mouth.

The inside of your nose has a layer of ________________ and lots of tiny hairs which trap pollen and dust and stop them from reaching your lungs.

The inside of your nose has a layer of mucous and lots of ___________ ____________ which trap pollen and dust and stop them from reaching your lungs.

The warm, DIRTY air moves down a tube (your windpipe) into the lungs.

Your lungs are in your _________.

The lungs are thin delicate so the ribs form a cage that protects them and allows space for them to expand.