Trachea

Definition

The trachea, also known as the windpipe, is a cylindrical tube that connects the larynx to the bronchi, allowing air passage to the lungs. It is lined with ciliated epithelium and mucus-secreting cells to trap and expel foreign particles.

5 Must Know Facts For Your Next Test

1. The trachea is approximately 10-12 cm in length and 2 cm in diameter in adults.
2. It is reinforced by C-shaped cartilaginous rings that prevent it from collapsing.
3. The trachea bifurcates into the left and right primary bronchi at a region called the carina.
4. Cilia on the epithelial lining beat rhythmically to move mucus upward towards the throat for expulsion.
5. Behind the trachea lies the esophagus, which allows for food passage to the stomach.

Review Questions

• What structural feature prevents the trachea from collapsing?
• Where does the trachea bifurcate into the primary bronchi?
• What function do cilia serve in the lining of the trachea?

Related terms

Larynx: The voice box located above the trachea that contains vocal cords.

Bronchi:

The two main branches off of the trachea that lead into each lung.

Cilia:

Microscopic hair-like structures on epithelial cells that help move mucus out of respiratory passages.