What happens during normal breathing?

To find out what could be affecting your ability to breathe properly, it’s helpful to first understand what normal breathing looks like.

Breathing is automatic

It might sound simple, but it’s important to realise that breathing is not something we have to consciously remember to do. It’s a reflex that is controlled by nerve cells in the brain and spine.

The upper and lower airways

The respiratory system is made up of 2 parts: the upper and lower airways.

Upper airway

Upper Airway diagram resmed

Lower airway

Lower Airway diagram resmed

The lower airway is protected by the chest cavity, which also contains the heart and lungs.

The breathing process

What starts the breathing process is actually the effort you make to draw air into your body.

When you breathe, the air entering your nose is cleaned, warmed and moistened. It then flows through your trachea, your bronchi and down to the alveoli of your lungs.

As you inhale and exhale, your chest and ribs expand and contract to allow for the air going in and out.

Abnormal breathing

As you can imagine, the everyday act of breathing can become very difficult if you have a respiratory condition that affects the airways, muscles, nerves, reflexes or organs involved in breathing.

Learn more about respiratory conditions:


More respiratory care

If you have a condition that makes it difficult for you to breathe properly, you might need the help of a ventilator. Find out about the appropriate diagnosis method for your condition.
Obesity Hypoventilation Syndrome (OHS)
Learn more about Obesity Hypoventilation Syndrome (OHS): what it actually is, the benefits of treatment, and ResMed’s treatment solution.
Chronic obstructive pulmonary disease (COPD)
Learn more about Chronic Obstructive Pulmonary Disease (COPD): what it actually is, the benefits of treatment, and ResMed’s treatment solution.
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