Respiration starts as air enter through the nostrils. It passes through the nasal cavity where air get cleaned and moistened by an extensive array of cilia. The air moves through the nasal passages and continues into the pharynx. From the pharynx air enters the trachea (windpipe) going into the lungs.
Describe how air flows through structures of the respiratory system to, and including, the alveoli of the lungs. What changes take place in the air as it descends to the alveoli?
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