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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 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 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 (AChE repackages ACh back into synaptic vesicles) ____Impulse stops to muscle: calcium ions rapidly return to SR ____Synaptic vesicles fuse with cell membrane CLICK HERE TO CHECK YOUR ANSWERS |
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