Mr Rush Outcome #9 (Describe the major events that occur when a muscle fiber contracts)
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Not completely understood
Step #1
Motor neuron releases neurotransmitter causing a muscle impulse and releases calcium ions.
Step #2
Calcium binds to troponin causing it to move tropomyosin away from binding sites on actin filament.
Step #3
Myosin cross-bridges attach to actin filaments
Step #4
Cross-bridges pull actin inward by bending
Step #5
