Final answer:
The bronchi are the main airways branching off from the trachea. They are lined with ciliated epithelium and contain cartilage to support their structure. The trachea bifurcates into the right and left bronchi, with the right bronchus leading to the larger right lung with three lobes, and the left bronchus leading to the smaller left lung with two lobes.
Step-by-step explanation:
The bronchi are the main airways that branch off from the trachea. They divide into the right and left primary bronchi, which enter the lungs at the hilum. The bronchi are lined with pseudostratified ciliated columnar epithelium and contain cartilage rings to support their structure and prevent collapse. They continue to branch into smaller bronchioles and eventually end in alveoli, where gas exchange takes place.
The trachea, on the other hand, is the windpipe that leads down to the chest. It bifurcates into the right and left bronchi in the lungs. The right bronchus leads to the right lung, which has three lobes, while the left bronchus leads to the left lung, which has two lobes.