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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

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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