Problem: The cross-bridge cycle starts when _________. select onea. ATP binds to troponin and is hydrolyzed to ADP and Pib. acetylcholine diffuses away from the synaptic cleftc. Ca2+ is actively transported into the sarcoplasmic reticulumd. Ca2+ from the sarcoplasmic reticulum binds to tropomyosine. Ca2+ from the sarcoplasmic reticulum binds to troponin

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The cross-bridge cycle starts when _________. select one

a. ATP binds to troponin and is hydrolyzed to ADP and Pi

b. acetylcholine diffuses away from the synaptic cleft

c. Ca2+ is actively transported into the sarcoplasmic reticulum

d. Ca2+ from the sarcoplasmic reticulum binds to tropomyosin

e. Ca2+ from the sarcoplasmic reticulum binds to troponin