Steps of Muscle Contraction
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Hi guys, welcome to the In Time Hospitals. Today through the time I'm going to show you the steps of muscle contraction.
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ACh is released into the neuromuscula junction by the axon terminal.
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ACh diffuses across theneuromuscular junctionand binds to receptorson the sarcolemma.
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Depolarization occurs,and the action potentialis generated.
The action potential,carried deep into the cell, causes the SR torelease calcium ions.
The calcium ionconcentration at themyofilaments increases,the myofilaments slide
As calcium is activelyreabsorbed into the SR,its concentrationdecreases at themyofilaments.
And final, The muscle cellrelaxes and lengthens.
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