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8. Explain the following:
(a) Role of Na' in the generation of action potential.
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Answer:
Sodium ions play an important role in the generation of action potential. When a nerve fibre is stimulated, the membrane potential decreases. The membrane becomes more permeable to Na+ ions than to K+ ions. ... The rapid inflow of Na+ ions causes the membrane potential to increase, thereby generating an action potential.
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Explanation:
neuron that emits an action potential, or nerve impulse, is often said to "fire". Action potentials are generated by special types of voltage-gated ion channels embedded in a cell's plasma membrane. ... This then causes more channels to open, producing a greater electric current across the cell membrane and so on.
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