The Respiratory System and Gas Exchange (simple) — free printable diagram

About this illustration

A labelled diagram of the human respiratory system showing a side-profile torso with cross-section of the head and neck. Key structures from nasal cavity to alveoli are labelled with leader lines. An enlarged circular inset shows alveoli with surrounding capillary network, indicating O2 in (green arrow) and CO2 out (blue arrow). Two smaller circular insets at the bottom show diaphragm movement during inhale (flat, arrow down) and exhale (domed, arrow up). A colour key bottom-right explains green = O2 in, blue = CO2 out.

How to use

1. 1Right-click the image and choose “Save image as”, or use the download button.
2. 2Use it in your classroom worksheets, slides or printables — free under CC BY-NC 4.0.
3. 3Attribute as “Image by Kuraplan” or link back to kuraplan.com. Not for commercial resale.