Muscle contraction

Muscle Contraction

Steps to Initiate

  1. ACh release

  2. Action Potential Reaches T-
    Tubule

  3. SR Releases Calcium

  4. Contraction Cycle Begins


Contraction Cycle

  1. Contraction Cycle Begins

  2. Active Site Exposure

  3. Cross-bridge Formation

  4. Myosin Head Pivoting

  5. Cross-bridge Detachment

  6. Myosin Reactivation


End Steps

  1. ACh is Broken Down at the
    NMJ, Ending the Action
    Potential

  2. SR Reabsorbs Calcium

  3. Active Sites Covered

  4. Contraction Ends & Muscle
    Relaxes