Endoscopy uses which instrument to visualize internal structures?

• A. Stethoscopes
• B. Endoscopes
• C. Thermometers
• D. Catheters

Answer: (B)

Visualizing internal structures during an endoscopy requires an instrument that can be inserted into the body and provide direct view inside hollow organs or cavities. The endoscope is designed for this purpose: it’s a slender tube with built-in illumination and a camera or eyepiece, allowing real-time viewing of mucosal surfaces in areas like the digestive tract, airways, or joints, and it may include channels for tools.

Stethoscope is used to listen to heart and lung sounds from outside the body, not to image interior structures. Thermometer measures temperature. Catheter is a tube used to access vessels or cavities for drainage or infusion, not for direct visualization.