🥩01
Muscle Organization
Zoom from a whole muscle down to the sarcomere. See each wrapping on the way.
Open →📊02
The Sarcomere
See actin, myosin, Z-lines, and the A, I, and H bands.
Open →💪03
Sliding Filament
Make the sarcomere contract. The Z-lines move closer, and the I-band & H-zone shrink.
Open →⚡04
Neuromuscular Junction
Nerve signal → acetylcholine → the muscle fires. Go step by step.
Open →📈05
Motor Units & Tension
Single twitch → summation → tetanus. Watch it on a live graph.
Open →🏃06
Muscle Fiber Types
Slow oxidative fibers last long. Fast glycolytic fibers give power.
Open →