Question

multiple - choice question
what is the pathway that a molecule of oxygen takes from air to blood?
nasal cavity, larynx, pharynx, trachea, bronchiole, bronchus, alveolar duct, alveolus, capillary
nasal cavity, pharynx, larynx, trachea, bronchus, bronchiole, alveolar duct, alveolus, capillary
capillary, alveolus, alveolar duct, bronchiole, bronchiole, bronchus, trachea, larynx, pharynx, nasal cavity

Explanation:

Oxygen enters through the nasal cavity, then passes through the pharynx, larynx, trachea, bronchus, bronchiole, alveolar duct, and alveolus before diffusing into the capillary. This is the correct sequence of the respiratory pathway for oxygen to reach the blood.

Answer:

B. nasal cavity, pharynx, larynx, trachea, bronchus, bronchiole, alveolar duct, alveolus, capillary