When you exhale, air passes through the respiratory structures in which order?
a) alveolus, trachea, bronchus, bronchiole, larynx, pharynx, nasal cavity
b) alveolus, bronchiole, bronchus, trachea, larynx, pharynx, nasal cavity
c) alveolus, trachea, bronchus, bronchiole, pharynx, larynx, nasal cavity

B. Alveolus, bronchiole, bronchus, trachea, larynx, pharynx, nasal cavity.

Explanation:

The process of gaseous exchange i.e. intake of oxygen from the atmosphere and release of Carbon dioxide produced by the cell is called respiration.

The Process of respiration include , Breathing, pulmonary respiration, transport of oxygen and carbon dioxide by blood and Tissue respiration.

Breathing is a physical process and includes inspiration and expiration.

The taking in of oxygen rich air into the lungs is called inspiration or inhalation.

Releasing carbon dioxide rich alveolar air in the process of breathing is called expiration or exhalation.

The parts of respiratory system are arranged as follows:

Thus, When air is inhaled its path is:

Nasal cavity→pharynx→larynx→Trachea→bronchus→ bronchiole →alveolus.

So when air is exhaled, it will follow the exactly opposite path i.e.

Alveolus→bronchioles→bronchus→trachea→larynx→ pharynx→nasal cavity.

hypoxemia refers to a below usual concentration of oxygen in the blood, mainly in the arteries. hypoxemia is an indication of an issue associated with circulation or breathing and may lead to various symptoms like shortness of breath.  

the condition is identified by determining the level of oxygen in the blood sample obtained from an artery. it can also be predicted by determining the oxygen saturation of the blood with the application of a pulse oximeter.  

the normal arterial oxygen is about 75 to 100 mm hg. the values underneath 60 mm hg is generally considered with the requirement for supplemental oxygen. the normal pulse oximeter readings generally range between 95 to 100 percent. the values under 90 percent are regarded as low.  

in the given case, the oxygen saturation is measured at 93 percent, hence, there is no need to administer oxygen, that is, one should withhold oxygen.