Respiratory System Diagram
Free printable respiratory system diagram — a labeled illustration of the nasal cavity, trachea, bronchi, lungs, diaphragm and more. Download a high-resolution PDF or PNG for Letter paper.
The parts of the respiratory system
The respiratory system brings oxygen into the body and removes carbon dioxide. Here is what happens at each labeled part of the diagram:
| Part | What it does |
|---|---|
| Nasal cavity | Warms, moistens and filters the air you breathe in. |
| Pharynx | The throat — a shared passage for both air and food. |
| Larynx | The voice box, which also guards the entrance to the airway. |
| Trachea | The windpipe that carries air down toward the lungs. |
| Bronchi | Two large tubes that branch from the trachea into each lung. |
| Bronchioles | Smaller branching tubes deep inside the lungs. |
| Lungs | The main organs of breathing, where oxygen passes into the blood. |
| Diaphragm | The dome-shaped muscle below the lungs that powers breathing. |
Companion worksheet
A free fill-in worksheet with an answer key, built from the labels above — students match each part to its description, then answer a couple of short questions. Great for a quick check after using the diagram.
How to print
Choose Download PDF for a ready-to-print file that fits US Letter paper (8.5 × 11") in landscape, or Download PNG for the high-resolution image.
Frequently asked questions
What does the respiratory system do?
It takes oxygen from the air into the body and removes carbon dioxide, the waste gas the body makes.
What is the diaphragm?
The diaphragm is a large dome-shaped muscle under the lungs. When it tightens and flattens, air is pulled into the lungs; when it relaxes, air is pushed out.
What paper size should I print this on?
The diagram is sized for standard US Letter paper (8.5 × 11") in landscape orientation. Use "Download PDF" for a print-ready file that fits the page automatically.