AON Assessment Practice Test 2025 - Free Practice Questions and Study Guide

The bell of the stethoscope is specifically designed to capture low-pitched sounds, which include bruits and heart murmurs. This is due to its shape and size, which allow it to effectively detect such sounds. The bell has a narrower opening compared to the diaphragm, which is designed for high-pitched sounds. Low-pitched sounds are typically softer and require a more sensitive detection method, making the bell the preferred tool for evaluating these types of bodily noises.

In contrast, high-pitched sounds like heartbeats are better detected using the diaphragm of the stethoscope, which is tailored for capturing sounds with higher frequency. Ambient sounds in the room are generally not captured by the stethoscope, as it is designed to focus on internal body sounds. Dormant sounds in the body are not specific sounds that can be actively identified through the stethoscope, as they imply a lack of sound or activity. Hence, the bell's primary purpose aligns with identifying the low-pitched sounds needed for proper assessment in clinical practice.