Our red blood cells take oxygen to our legs to help us run.

My diaphragm keeps moving so that I breathe even without thinking about it.

I don't need the carbon dioxide my blood picks up, so I exhale it.

The nutrients in the food I eat gets carried to my arms and legs so I can run and play.

I need to lift my foot and leg to walk across the room.

My brain sends messages to my mouth to make saliva to help me swallow my sandwich.

New blood cells are produced inside my pelvis.

Nutrients in my dinner get carried along with oxygen inside my blood cells.

My ribs keep my lungs safe if I get hit.