Membrane Potentials is part of the General Physiology section of Physiology. Practise 34 exam-style MCQs for NEET PG, FMGE, INI-CET and NEET SS, each with the correct answer and a detailed explanation.
Potassium-driven resting potential, the Nernst equation and equilibrium potentials — sodium highest at +60 mV — structure these Membrane Potentials MCQs, which pair refractory periods with high-yield NEET PG calculation practice.
No net electro genic transfer at RMP means X+Y+Z=0 Since X= -50 and Y= -30 then Z must be +80 since (-80+80=0) Reference: Guyton textbook of Medical physiology, 11 th edition page no.58
At rest, the inside of the cell is negative compared to the exterior. This inside negativity is called as Resting Membrane Potential (RMP) At rest, cell is permeable to potassium ions (positively charged) through leaky potassium ion channels. This passive diffusion of potassium ions from inside to outside of the cell generates RMP. It is also called as diffusion potential Reference: Ganong, 25th edition page no.9
Equilibrium potential for single ion can be calculated from Nerst equation Describes relation of diffusion potential to on conc difference across a membrane In reality, multiple ions more across cell membrane → Goldman equation is used According to Nernst equation, EMF (mV) = + 61/z x log (conc inside/ conc outside) where EMF is electromotive force and z is electrical charge of ion Reference: Guyton & Hall, 14th edition pg no. 61
Resting membrane potential of nerve is equal to equilibrium potential of chloride ion Reference: Ganong, 25 th edition page no.10
The equilibrium potential for any ion X can be calculated from an equation called as Nernst equation which is: EX = ±61 log [X o]/[Xi] where EX = equilibrium potential, [Xo] = concentration outside the cell, [Xi] = concentration inside the cell Reference: Ganong, 25 th edition page no .9
D i.e. Depends on potassium ion equilibrium
Absolute refractory period - No stimulus, no matter how strong, will not excite the nerve during absolute refractory period Relative refractory period - stronger than normal stimulus (suprathreshold stimulus) produces action potential in relative refractory period Reference: Ganong, 25 th edition page no. 90
Maximum equilibrium potential is for sodium ion (+60 mV) Reference: Ganong, 25 th edition page no. 9
Potassium-driven resting potential, the Nernst equation and equilibrium potentials — sodium highest at +60 mV — structure these Membrane Potentials MCQs, which pair refractory periods with high-yield NEET PG calculation practice.
MedLadder includes 34 curated MCQs for Membrane Potentials under Physiology (General Physiology), covering NEET PG, FMGE, INI-CET and NEET SS preparation.
