What causes rhonchus sounds in the respiratory system?

Rhonchus sounds, often described as a low-pitched, snoring or rumbling sound, are produced due to the obstruction or inflammation of the bronchi. When airflow is disrupted in the airways, whether due to mucus accumulation, swelling, or other blockages, it leads to turbulence in the airflow as it passes through the narrowed or obstructed sections. This turbulence generates the characteristic sound known as rhonchi.

It’s important to relate this to other options as well. Normal breathing patterns would not produce any abnormal sounds like rhonchi, as they imply unobstructed and clear air passages. Fluid accumulation in the lungs is associated more with crackles or rales rather than rhonchi, as these sounds occur when fluid in the alveoli causes similar restrictions. Airway dilation typically helps to alleviate sound disturbances by allowing smoother airflow, thereby reducing or eliminating the rhonchus sounds. Thus, obstruction or inflammation is the key factor that leads to the production of rhonchi.