Bronchi

Definition

Bronchi are the major air passages that branch off from the trachea into the lungs. They play a crucial role in directing air to the alveoli for gas exchange.

5 Must Know Facts For Your Next Test

1. The bronchi split into smaller branches called bronchioles.
2. Each bronchus leads into one lung, with the right bronchus serving the right lung and the left bronchus serving the left lung.
3. The walls of the bronchi contain cartilage, which helps keep them open.
4. The lining of the bronchi is covered with cilia and mucus to trap and remove particles and pathogens.
5. Conditions such as bronchitis and asthma involve inflammation or constriction of the bronchi.

Review Questions

• What structural feature helps keep the bronchi open?
• How do cilia and mucus in the bronchi contribute to respiratory health?
• Into what smaller structures do the bronchi further divide?

Related terms

Trachea: The windpipe that connects the larynx to the bronchi, allowing passage of air to and from the lungs.

Alveoli: Tiny air sacs at the end of bronchioles where gas exchange occurs between air and blood.

Bronchioles: Smaller branches of the bronchi that lead directly to alveolar sacs for gas exchange.