Consider a typical cell at its resting membrane potential (rest V_m). The membra

Question

Consider a typical cell at its resting membrane potential (rest V_m). The membrane temporarily becomes more permeable to Na+. Ena = +55mV, resting Vm = 60m V Does an electrical force exist, if so in what direction? a. Yes, inward b. Yes, outward c. No, an electrical force does not exist Consider a typical cell at its resting membrane potential (rest V_m). The membrane temporarily becomes more permeable to Na+. Ena = +55mV, resting V_m = -60m V What direction will the ion flow? a. Inward b. outward c. Cannot state from the given information

Explanation / Answer

The positive ENa (equilibrium potential for Na+) means that in order to balance the inward directed chemical gradient for Na+, the cell (interior) needs to be +55 mV to prevent Na+ from diffusing into the cell.

2. (a) Electrical force exist and it is in inward direction.

At a resting membrane potential of -60 mV, there is a large electrical driving force acting upon external Na+ to cause it to diffuse into the cell.

3. The ion will flow in inward direction.

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