Sliding Filament Theory of Muscle Contraction 1. Sarcomere shortens, filaments remain the same length. Ach from motor neuron depolarizes sarcolemma. Muscle fibers contain creatine phosphate. Storage form of high energy phosphates.
Contraction ends when nerve impulse no longer stim.
Creatine phosphate depleted. Deep breathing restores O2. Lactic acid to liver.