# What are bronchioles?

It is called the bronchioles. Gray's Anatomy (1918) describes it as the smallest air-conducting tubes of the lung.

## What it means

- The smallest air-conducting tubes of the lung.
- Less than 1 mm across.
- Their walls contain smooth muscle but no cartilage.

## Action steps

1. Inside the lungs, beyond the smallest bronchi.
2. End in the terminal bronchioles, which lead to the alveoli.
3. Distributed throughout every part of the lung.

## Sources

- [Gray's Anatomy of the Human Body (1918)](https://www.bartleby.com/107/)

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