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 synamsin on 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 nerves 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 (AChE repackages ACh back into synaptic vesicles)
____Impulse stops to muscle: calcium ions rapidly return to SR
____Synaptic vesicles fuse with cell membrane
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