Follow a red blood cell through the heart.

Narrated 3D anatomy, circulation flights, physiology simulations and learning missions across a 59-stop atlas. Runs in your browser; headphones recommended.

• Narration uses your browser's speech; it can be muted inside.
• Keyboard and touch controls; reduced motion keeps this poster until you choose to enter.

Educational 3D atlas adapted from an open-source model set (see licences). Not clinical advice; clinical review of the stops is a separate human gate.