Final answer:
A bronchus is a smaller branch of cartilaginous tissue that carries air between the trachea and the alveoli in the lungs. It plays a crucial role in the process of breathing and gas exchange.
Step-by-step explanation:
A bronchus is one of the many tubes that carry air between the trachea and the alveoli in the lungs. It is a smaller branch of cartilaginous tissue that stems off of the trachea. Air is funneled through the bronchi to the region where gas exchange occurs in the alveoli. The bronchi and bronchioles are part of the respiratory system and play a crucial role in the process of breathing and gas exchange.