respiratory system

It is a long tube. The air goes down this tube.

• bronchi

• windpipe

When we breathe in...................enters our lungs and passes into the blood.

• oxygen

• carbon dioxide

The windpipe is also called

• trachea

• alveoli

When we breathe out , ................. leaves our body.

• oxygen

• carbon dioxide

They are two sacks protected by the ribs.

• alveoli

• lungs

Inside the lungs there are lots of little sacks called.......

Here, oxygen passes into the blood and carbon dioxide leaves the blood.

• lungs

• alveoli

They are two tubes .Oxygen enters the lungs through .......

• bronchi

• alveoli

When we ........................ oxygen goes down the windpipe

• breathe out

• breathe in

When we ................... carbon dioxide leaves our body.

• breathe in

• breathe out

When we breathe in , oxygen enters the body through our mouth or ............

• ears

• nostrils