Which statement is correct regarding nerve impulse conduction? 1 The membrane potential change from positive to negative and then back again 2 sodium ions flow out through ions channels and potassium ion flow in. 3 potassium channels close as the membrane potential become positive 4 The membrane potential becomes less negative due to opening of Na voltage gated channels

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\begin{matrix} Column I & Column II A.Synapse & I. Opening of sodium channels resulting in rapid influx of sodium and closing of sodium channels. B.Repolarization phase & II. The electrical potential difference across the resting plasma membrane. C. Resting Potential & III. The site of transmission of electric nerve impulses between two neurons. D. Depolarization & IV. Opening of potassium channels and rushing out of potassium. \end{matrix}

\begin{matrix} C o l u m n I & C o l u m n I I & C o l u m n I I I A . R e s t i n g m e m b r a n e p o t e n t i a l & (i) N A^{+} c h a n n e l g e t o p e n & (p) N a^{+} a n d K^{+} p u m p s a r e r e s p o n s i b l e f o r i t B . A c t i o n p o t e n t i a l & (i i) N a^{+} c h a n n e l i s c l o s e d & (q) L a s t f o r v e r y s h o r t t i m e C . D e p o l a r i s a t i o n & (i i i) N a^{+} i o n s a r e m o r e o n o u t e r s i d e o f m e m b r a n e & (r) K^{+} i o n s m o v e o n o u t e r s i d e D . R e p o l a r i s a t i o n & (i v) N a^{+} i o n s a r e m o r e o n i n n e r s i d e o f m e m b r a n e & (s) P o s i t i v e c h a r g e o n i n n e r s i d e o f m e m b r a n e \end{matrix}

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