A) \[{{K}^{+}}\] gate closed and \[N{{a}^{+}}\] gate open
B) \[N{{a}^{+}}\] channels are closed and \[{{K}^{+}}\] channels are open
C) both gates remain open
D) both K+ and Na+ gates are closed
Correct Answer: B
Solution :
During repolarisation \[N{{a}^{+}}\] channels are closed. Actually it occurs due to depolarisation, so that no more \[N{{a}^{+}}\] ions can enter the cell. After about 0.5 ms, permeability to \[{{K}^{+}}\] ion increase because the buildup of positive charge inside the cell opens voltage-gated \[{{K}^{+}}\] channels.
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