What are bronchioles?

The pathway of air from mouth to alveoli, the features of the alveoli that help gaseous exchange, diffusion of oxygen and carbon dioxide, and haemoglobin.

What you need to know

Answer each one before you reveal it.

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Key term

Describe the pathway of air from the mouth or nose to the alveoli.

Key term

What is the trachea, and where does it lead?

Key term

What are the bronchi?

Questions from this subtopic

Each one with the model answer underneath.

1
Describe the pathway of air from the mouth or nose to the alveoli.
Model answer
Air passes from the mouth or nose into the trachea, then the bronchi and bronchioles. Air finally reaches the alveoli.
2
What is the trachea, and where does it lead?
Model answer
The trachea is the windpipe that carries air from the mouth and nose towards the lungs. The trachea divides into two bronchi.
3
What are the bronchi?
Model answer
The bronchi are the two tubes that branch from the bottom of the trachea. One bronchus leads into each lung.
4
What are bronchioles?
Model answer
Bronchioles are the small airways that branch off the bronchi throughout the lungs. Bronchioles carry air to the alveoli.
5
What are the alveoli?
Model answer
The alveoli are tiny air sacs at the ends of the bronchioles. Gas exchange with the blood takes place at the alveoli.
6
What is gaseous exchange?
Model answer
Gaseous exchange is the swap of gases between the alveoli and the blood. Oxygen diffuses into the blood and carbon dioxide diffuses out.

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