Tube that connects the upper respiratory system to the lungs, Respiratory System, Trachea, Lungs, People breathe in, oxygen, lungs, gasoline, People breathe out, plants, carbon dioxide, trachea, It brings air in and out of the body, lungs, air, nasal cavity, It is a passageway for air and food, pharynx, bronchi, air, It provides an open airway when breathing, nasal cavity, larynx, respiratory system, They are smaller tubes that bring air to and from the lungs., carbon dioxide, bronchi, energy, They put oxygen into the bloodstream, oxygen, trachea, lungs

Respiratory System

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