sliding filament theory

• Sliding Filament Theory step #1


  Electrical impulse arrives at the relaxed muscle via the CNS
• Sliding FIlament Theory step #2


  Calcium is released which bonds the crossbridges to the actin
• Sliding Filament Theory step #3


  Crossbridges begin to pull the actin filaments towards the middle
• Sliding Filament Theory step #4


  Muscle contracts and shortens