What happens when Ca2+ are released in the cytoplasm of the muscle cell?
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Explanation:
Travels down a motor neuron and down T-tubules into muscle fibre.
-Ca2+ released from SR.
-Tropomyosin moves and uncovers myosin binding site on actin.
-Crossbridge formation = myosin binds to actin.
-Power stroke = stored energy in myosin head is released and myosin head pivots.
-Cross-bridge breaks as ATP binds myosin head.
-Myosin reactivation = myosin head splits ATP into ADP and Pi and 're-cocks' ready for another contraction cycle.
-Contraction cycle repeats if Ca2+ is still present. Bind, power stroke, detach and extend.
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pls refer to the attachment above
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