Skeletal muscle

• Muscle fibres are multinucleate

  For protein synthesis
• Myofibrils have lots of mitochondria for ATP
• What is a myofibril

  A organell made up of filaments

  Actin and myosin
• Actin

  Thinner filament

  Made of 2 strands coiled around each other
• Myosin

  Consist of 2 rod shaped fibres with bulbed heads

  Thicker filament
• Other proteins involved in muscles

  Tropomyosin

  Troponin
• Sliding filament mechanism

  Actin and myosin slide over each other
• When Actin and myosin slide over each other

  Sacromere gets shorter

  I band and H zone get narrower

  Z line close together