Process of repolarization and depolarization in a cell
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In normal condition, the outer side of nerve fibre carries positive charge. this is called polarised state.this polarization is due to Na+ ions outside the axon membrane.
On stimulation, the axon membrane at that spot becomes more permeable to Na+ ions which move inwards and causes depolarization. this is known as excited region.
the point of depolarization becomes a stimulus for the next neighbouring area of the membrane which in turn becomes depolarized.
meanwhile, the previous area becomes repolarized due to active transport of Na+ ions again to the outside.
This Transport is achieved by what is called "sodium pump" using energy through ATP.
On stimulation, the axon membrane at that spot becomes more permeable to Na+ ions which move inwards and causes depolarization. this is known as excited region.
the point of depolarization becomes a stimulus for the next neighbouring area of the membrane which in turn becomes depolarized.
meanwhile, the previous area becomes repolarized due to active transport of Na+ ions again to the outside.
This Transport is achieved by what is called "sodium pump" using energy through ATP.
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