AST Surgical Technologist Practice Exam 2025 - Free Surgical Tech Practice Questions and Study Guide

The structure that includes divisions of oral, nasal, and laryngeal is the pharynx. The pharynx is an important part of both the respiratory and digestive systems. It acts as a pathway for air from the nasal cavity to the larynx and for food from the oral cavity to the esophagus.

The pharynx is divided into three main regions: the nasopharynx, which is located behind the nasal cavity; the oropharynx, which is located behind the oral cavity; and the laryngopharynx, which is located above the larynx and leads into the esophagus. Each of these divisions serves a specific function, facilitating the passage of air and food and playing a crucial role in breathing and swallowing.

The other options do not encompass all three divisions mentioned. For example, the larynx is primarily involved in voice production and does not include the oral division, while the trachea is primarily a conduit for air to the lungs. The nasopharynx, while part of the pharyngeal structure, does not include the oral or laryngeal aspects fully as standalone entities. Therefore, the pharynx is the correct answer as it integrates all three areas.