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PRACTICE QUIZ OF COMPLETE MUSCLE CONTRACTION FROM ARRIVAL OF ACTION POTENTIAL! PLEASE PRINT THIS PAGE AND THEN NUMBER THE SEQUENCE IN CORRECT ORDER. CHECK YOUR WORK WITH THE LINK BELOW

____Calcium ions released

____Calcium ions rush in and react with synaptic vesicles

____Myosin (S1 units) combine with actin

____With ATP present, ATPase splits ATP to ADP + Pi + Energy

____Tropomyosin returns over active sites on actin and contraction ceases

____Impulse travels T- tubules & excites sarcoplasmic reticulum (SR)

____Motor nerve’s impulse action potential arrives at axon terminal of the neuromuscular junction

____Shift of tropomyosin, make sites available for myosin

____Acetylcholine released via process of exocytosis

____Calcium binds with troponin

____Sliding action of actin over myosin (Power Stroke)

____Acetylcholine binds with receptor sites on motor end plate causing depolarization of motor end plate and sarcolemma

____Impulse stops to muscle: calcium ions rapidly return to SR

____Synaptic vesicles fuse with cell membrane

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