What is the main job of the respiratory system?

To bring oxygen to the body and remove carbon dioxide

Name two parts of the respiratory system.

Lungs, trachea, bronchi, bronchioles, alveoli, nose, mouth, diaphragm, intercostal muscles

The autonomic nervous system sends a signal to the muscles around the lungs.

The diaphragm flattens, the intercostal muscles contract, and air rushes into the lungs.

I can describe how the respiratory system helps us breathe.

1
The autonomic nervous system signals muscles around the lungs, flattening the diaphragm and contracting intercostal muscles to create space for the lungs to expand.
2
Air travels through the trachea and into the bronchi, which split into thousands of smaller passages called bronchioles.
3
At the end of each bronchiole is an air sack called an alveolus, where oxygen and carbon dioxide are exchanged.