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| PRACTICE QUIZ OF MUSCLE CONTRACTION! PLEASE NUMBER THE SEQUENCE OF MUSCLE CONTRACTION IN CORRECT ORDER 7—Calcium ions released 2—Calcium ions rush in and react with synaptic vesicles 11—Myosin (S1 units) combine with actin 10—With ATP present, ATPase splits ATP to ADP + P + Energy 14—Tropomyosin returns over active sites on actin and contraction ceases 6—Impulse travels T- tubules & sarcoplasmic reticulum (SR) 1—Motor nerve’s impulse action potential arrives at axon terminal of the neuromuscular junction 9—Shift of tropomyosin, make sites available for myosin 4—Acetylcholine released via process of exocytosis 8—Calcium binds with troponin 12—Sliding action of actin over myosin (Power Stroke) 5—Acetylcholine binds with receptor sites on motor end plate causing depolarization of motor end plate and sarcolemma 13—Impulse stops to muscle: calcium ions rapidly return to SR 3—Synaptic vesicles fuse with cell membrane End |
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