The body is built in six nested levels — each one assembled from the level below it. Zoom out from a single atom all the way to a whole human, following one thread: the smooth muscle in a blood-vessel wall.
Chemical level
~0.1 nm
Chemical levelatoms & molecules
Climb the ladder
📷 Reference image
A real labeled figure to compare with the interactive above.
Levels of Structural Organization — OpenStax, CC BY 4.0 (via Wikimedia Commons)
