Kaplan Nursing Entrance Practice Exam

What is the role of the larynx in the respiratory system?

1. Divert food into the esophagus

2. Create sound through vibration

3. Moisten and warm air

4. Control respiration rate

The correct answer is: Create sound through vibration

The larynx, commonly known as the voice box, plays a primary role in the creation of sound through vibration. As air is pushed from the lungs through the trachea and into the larynx, it passes through the vocal cords (or vocal folds), which are located within the larynx. When the vocal cords come together, air pressure causes them to vibrate, producing sound. The pitch and volume of the sound can be modified by adjusting the tension and position of the vocal cords. While other options may pertain to the functions of various parts of the respiratory or digestive systems, they do not relate to the primary function of the larynx. For example, diverting food into the esophagus is the role of the epiglottis and the pharynx, not the larynx. Similarly, while warming and moistening air are functions associated with the nasal passages, control over respiration rate is primarily managed by the brainstem and does not involve the larynx directly.