Number the events below 1 7 to represent the correct sequenceof event...

Number the events below 1 â€“ 7 to represent the correct sequence of events in skeletal...

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Medical Sciences

Number the events below 1 â€“ 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

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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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