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What important activity takes place in the lungs?

• Food is digested
• Waste filtered from blood
• Oxygen (O2) is exchanged for Carbon Dioxide (CO2)
• Trachea is exchanged for the larynx

The air sacs that are covered with capillaries where gas exchange takes place

• bronchi
• lungs
• oxygen
• alveoli

Name the organ label # 6. 

• alveoli 
• bronchi 
• trachea 
• lungs 

After air moves through the pharynx it continues downward. The _____, or windpipe, directs the air into 2 separate branches or tubes.

• mucus
• trachea
• larynx
• epiglottis

healthy _____ are usually pink in color. You have two of these.

• alveoli
• epiglottis
• lungs
• trachea

the gas known as _______ is needed to stay alive and properly.

• oxygen
• carbon dioxide
• nitrogen
• helium

What is breathed out from our mouth and nose?

• carbon dioxide
• oxygen
• nitrogen
• helium

Tubes that move air from the trachea to the lungs.

• Alveoli
• Bronchi
• Veins
• Arteries

Letter D is pointing to which Respiratory organ?

• Alveoli
• Diaphragm
• Lung
• Bronchi

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

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