Chapter 10 Excitation-Contraction Coupling and Cross-Bridging
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ECC step 1
an action potential travels across the sarcolemma deep into the myofibril via the transverse tubule
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ECC step 2
the action potential causes the sarcoplasmic reticulum to release calcium
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ECC step 3
calcium binds with troponin changing the position of the tropomyosin-troponin complex exposing the myosin-binding sites on the actin filaments
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Cross-Bridging step 1
cross bridges form when myosin heads attach to the myosin binding sites of actin filaments
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Cross-Bridging step 2
power stroke of myosin heads occurs, sliding thin myofilaments along thick filaments, shortening the sarcomere
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Cross-Bridging step 3
cross bridges detach
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Cross-Bridging step 4
reactivation of the myosin head
Note 
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