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Q8.    Explain the following:

         (a) Role of Na+ in the generation of action potential.

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Sodium ions diffuse from the outside to the intracellular fluid because of the electrochemical gradient. The potassium ions move out, and the membrane becomes negatively charged from outside and positively charged from inside. This sudden change in the membrane potential is called the action potential, and the membrane is said to be depolarised.

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Priyanka Kumari

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