Contraction cycle

    Cards (6)

    • Neuron signals (nerve impulses)
      1. Released from the spinal cord
      2. Release of calcium
      3. Synaptic pump releases acetylcholine
    • Muscle contraction
      1. Acetylcholine attaches to acetylcholine receptors in muscle fibers
      2. Muscle is in an excitation state
    • Cross-bridge cycle

      Connection between the head of myosin filaments and actin filaments causes action
    • ATP hydrolysis
      1. ATP hydrolyses to ADP and phosphate
      2. Myosin is ready to attach to actin filaments
    • Calcium attachment
      1. Calcium attaches to troponins
      2. Exposes the site of attachment in actin filaments
      3. Power stroke state where the sarcomere shortens
    • Muscle contraction and relaxation
      1. ATP plays an important role in the separation of the myosin and actin
      2. When the muscle is in a resting position, tropomyosin and troponin block the myosin-binding sites on actin filaments
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