Question

initiation of nerve impulse is caused due to increase in the permeability of by covering membrane : (a) K+ (b) Na+ (c) Ca+ (d) Water molecules​

Answer 1

Answer:

Na+

Explanation:

At resting state the axonal membrane has a net negative charge as the number of Na+ ions outisde in the extra cellular fluid are more as compared to the K+ ions inside the cell. this is called the resting state. when an impulse reaches the axon, it leads to the opening of Na+ gated channels leading to the influx of Na+ from outside to inside the cell which changes the polarity of the membrane.