🥩01
Muscle Organization
Zoom from whole muscle down to the sarcomere, with its wrappings.
Open →📊02
The Sarcomere
Actin, myosin, Z-lines, and the A / I / H bands.
Open →💪03
Sliding Filament
Contract the sarcomere — Z-lines close, I-band & H-zone shrink.
Open →⚡04
Neuromuscular Junction
Nerve signal → acetylcholine → the muscle fires, step by step.
Open →📈05
Motor Units & Tension
Single twitch → summation → tetanus, on a live graph.
Open →🏃06
Muscle Fiber Types
Slow-oxidative endurance vs fast-glycolytic power.
Open →