Introduction Answers

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What is the primary function of the lower respiratory system?

to move nutrients to the cells throughout the body

to move blood to the cells throughout the body

to extract oxygen from the air that the body breathes in

to extract oxygen from the blood that the body makes

What do the trachea and the bronchial tubes have in common? Check all that apply.

They act as passageways for air.

They are lined with epithelial cells.

They extract oxygen from the air.

They are lined with thin muscles.

By which pathway does oxygen flow into the body?

trachea, bronchioles, bronchial tubes, alveoli

trachea, bronchial tubes, bronchioles, alveoli

trachea, alveoli, bronchioles, bronchial tubes

trachea, alveoli, bronchial tubes, bronchioles

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