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Pharynx

 It is the region after the nasal cavity which acts as passageway for air that leads
into the trachea.

Larynx

 It is also called voice-box.
 It contains vocal cords that vibrate when air passes through them.

Trachea

 It is also called windpipe
 It is a tube like–structure which is guarded by an opening called glottis, which
gets covered by the epiglottis when we eat or drink.
 The trachea extends further and splits into two bronchi (singular:Bronchus),one
for each lung.

Bronchioles

 Each bronchus further divides into tiny branches called bronchioles.
 Bronchioles terminate into tiny air sacs called alveoli.

Alveoli (Singular-alveolus)

 It gives the appearance of a bunch of grapes.

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