Final answer:
Rhonchi are the adventitious breath sounds that occur on both inspiration and expiration when inhaled air collides with secretions in the trachea and large bronchi. They sound like opening a Velcro fastener and may decrease with a cough but reappear shortly after.
Step-by-step explanation:
The adventitious breath sounds described in the question are rhonchi. Rhonchi are caused by inhaled air colliding with secretions in the trachea and large bronchi. They sound like opening a Velcro fastener and may decrease with a cough but reappear shortly after.