Lungs

The lungs are located

• In your chest, on the right side.
• In your chest, on the left side.
• In your chest, on both sides.

Our bodies need the _________ in the air we breathe.

• feathers
• oxygen
• carbon dioxide

When you breathe hard, your body...

• gets really sweaty.
• takes in more oxygen.
• sounds loud.

When you exercise, your heart beats faster to...

• spread oxygen throughout your body more quickly.
• make you feel excited.
• let you know you're working hard.

What are the main organs of gas exchange in the respiratory system?

• diapragm
• lungs
• trachea
• bronchi

Where does air first enter your body?

• ears

• eyes

• toes

• nose or mouth

When you breathe, your lungs take in ___ and remove ___. 

• air/oxygen
• oxygen/carbon dioxide 
• carbon dioxide/waste 
• waste/air