Final answer:
Vesicular breath sounds are the normal sounds of gas rustling through the small bronchioles and alveoli, and are low-pitched and soft. The correct answer is option A).
Step-by-step explanation:
The normal sounds of gas rustling or swishing through the small bronchioles and possibly the alveoli are known as Vesicular breath sounds. These sounds are low-pitched and soft, heard throughout inspiration and continue without pause through expiration.
They occur as air moves through the larger bronchial tubes and into the smaller airways closest to the lung tissue, specifically the alveoli, which is where gas exchange occurs. This contrasts with Bronchial breath sounds, which are higher-pitched and heard over the trachea, and Tracheal breath sounds.
Which are harsh and heard over the throat area. Wheezing, another type of abnormal breath sound, is high-pitched and usually associated with narrowed airways. They are mainly heard over the periphery of the lungs.