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zoo141 chap 9 (2)

muscle fiber relaxation

QuestionAnswer
Muscle fiber relaxation step 1 no more action potentials in motor neuron → no more ACh released
Muscle fiber relaxation step 2 AChE breaks down ACh that was previously released
Muscle fiber relaxation step 3 no more ACh left to bind to receptors on sarcolemma → no action potential in muscle cell sarcolemma
Muscle fiber relaxation step 4 Ca no longer released from SR, and is pumped back into SR
Muscle fiber relaxation step 5 Ca no longer binds to troponin, causing tropomyosin to move to block the active sites on actin
Muscle fiber relaxation step 6 myosin heads are blocked from binding to actin
Created by: btuehara
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