During exercise or during respiratory distress, the mouth can be used as an additional opening of the respiratory system and then the [[Oropharynx - Anatomy & Physiology|oropharynx]] also becomes an air-way. | During exercise or during respiratory distress, the mouth can be used as an additional opening of the respiratory system and then the [[Oropharynx - Anatomy & Physiology|oropharynx]] also becomes an air-way. |