Final answer:
Normal breath sounds made by air moving through the bronchi are called vesicular breath sounds, which are low-pitched and soft. The options given (wheezing, crackles, rhonchi, stridor) represent different types of abnormal breath sounds associated with various respiratory conditions.
Step-by-step explanation:
The normal breath sounds made by air moving through the bronchi are none of the options provided: wheezing, crackles, rhonchi, or stridor. These are all abnormal sounds. The normal sounds are called vesicular breath sounds and are heard during the passage of air through the respiratory tree.
Vesicular breath sounds are low-pitched and soft. Wheezes or stridor are specific types of abnormal breath sounds, with wheezing often associated with asthma or bronchitis and stridor with obstructions in the larynx or trachea. Crackles are heard in conditions like pneumonia or heart failure, and rhonchi can indicate secretions in the larger airways.