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Number the events below 1 – 7 to represent the correct sequence of events in skeletal...

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Medical Sciences

Number the events below 1 – 7 to represent the correct sequenceof events in skeletal muscle contraction and relaxation

___Ca2+ binds to troponin; tropomyosin moves, exposing theactive site of actin

___Acetylcholine (ACh) triggers an end-plate potential in themotor end plate.

___ The motor neuron stops releasing ACh andAcetylcholinesterase degrades the ACh in the synaptic cleft

___An Action potential in the sarcolemma travels down theT-Tubules

___ Ca2+ is released from the sarcoplasmic reticulum into thecytosol

___ The cytosolic concentration of Ca2+ returns to the restinglevel, the active sites of actin are blocked, and the muscle fiberrelaxes

___ Actin and myosin bind, and myosin undergoes a power stroke.ATP detaches actin and myosin, and the cycle repeats resulting incontraction of the muscle fiber

Answer & Explanation Solved by verified expert
4.4 Ratings (796 Votes)
1 Acetylcholine ACh triggers an endplate potential in the motor end plate 2 An Action potential in the sarcolemma travels down the TTubules 3 Ca2 is released from the sarcoplasmic reticulum into the cytosol 4 Ca2 binds to troponin tropomyosin moves exposing the active site of actin 5 Actin and myosin bind and myosin undergoes a power stroke ATP detaches actin and myosin and the cycle repeats    See Answer
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