5 a What is the direction of current flow through a Na chann

5. (a) What is the direction of current flow through a Na+ channel at Vm = 0 mV. Assume GNa is 1 and ENa = +30 mV. (b) How will this current flow impact membrane potential?

Solution

a)   direction of current flow through a Na+ channel at Vm = 0 mV will be due to high extracellular and low intracellular concentrations between Na+ channels. Current will flow outside the nerve cell and inward through the membrane. It is primarily carried out by Na⁺ ions.

B)   GENERALLY this type of current flow can stable themembrane potential. we can say it is relatively stable so that we can called it resting membrane potential (RMP). A RMP for mammalian nerve cells lies between +70mV to 100 mV.

different other impact may be they could not produce action potentials, they could not conduct impulses. so current flow has a important impact on memebrane potential.