Place where air enters the body; warms, moistens, and filters incoming air.

• lungs
• mouth
• bronchioles
• nasal cavity/nose

Main organ of the respiratory system.

• lungs
• trachea
• larynx
• bronchioles

Smaller branches of the bronchi inside the lungs.

• alveoli
• bronchioles
• larynx
• mouth

Main muscle that controls breathing by changing pressure in the chest cavity when it contracts or relaxes.

• mouth
• pharynx
• diaphragm
• alveoli

Flap that closes over the trachea when swallowing to keep food from “going down the wrong pipe”; remains open when breathing.

• alveoli
• epiglottis
• larynx
• pharynx

Windpipe; tube leading into the chest cavity.

• pharynx
• trachea
• bronchi
• diaphragm

“Grape-like”, Tiny, thin walled sacs where oxygen and carbon dioxide are exchanged.

• alveoli
• epiglottis
• nasal cavity
• bronchioles

Branches of the trachea that lead to each lung.

• bronchi
• pharynx
• bronchioles
• alveoli

“Voice box”; makes sounds as air passes through vocal cords.

• trachea
• bronchi
• mouth
• larynx

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

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