Local anaesthetics act by inhibiting -: (A) Influx of K+, (B) Efflux of K+, (C) Influx of Na+, (D) Efflux of Na+
Answer is C. Ans. is 'c' i.e., Influx of Na+ The LAs block nerve conduction by decreasing the entry (influx) of Na+ ions during upstroke of action potential.