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How muscle gets excited about contraction?

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Excitation for Muscle Contraction: 

  • Nerve impulse promotes releasing of Neurotransmillar Acetylcholine the ends of the axon at Neuromuscular junction. 
  • This chemical changes permeability in the plasma membrane of muscle towards Na+
  • Due to this, Na+ enters into the muscle cell and causes a change in charge (axon potential), which is +ve inside the plasma membrane. 
  • In normal condition, there is -ve charge inside the inner surface of the plasma membrane. 
  • This positive change is transferred on the whole plasma membrane of muscle and generates an action potential, which is known as Excitation state of muscles.

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