DOH Abu Dhabi Licensing Exam — free MCQ practice

1. The conducting zone has three named jobs: route the air, remove debris and pathogens, and warm and humidify the air. 2. Warming and humidifying is therefore the correct answer. 3. Cooling and drying is the exact opposite of what the airway does to inhaled air. 4. Gas exchange belongs to the respiratory zone, and carbon dioxide is added to alveolar air at the exchange surface, not along the conducting passages. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.1 Organs and Structures of the Respiratory System_

1. The conchae are bony projections on each lateral wall of the nasal cavity. 2. They increase the surface area of the cavity and disrupt the flow of air, so incoming air bounces along the epithelium. 3. That bouncing is what allows the air to be cleaned and warmed, so the third option is correct. 4. Mucus is produced by goblet cells of the respiratory epithelium rather than by the conchae themselves. 5. Closing off the nasal cavity during swallowing is the job of the uvula and soft palate, which rules out the second option. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.1 Organs and Structures of the Respiratory System_

1. Each lateral wall of the nasal cavity carries superior, middle and inferior conchae. 2. The inferior conchae are separate bones in their own right. 3. The superior and middle conchae are portions of the ethmoid bone, not independent bones. 4. So only the inferior pair qualifies, and every option that names the superior or middle conchae is wrong. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.1 Organs and Structures of the Respiratory System_