Membrane Potential questions well answered 2023

Membrane PotentialDo all living cells have a membrane potential? - correct answer UMM YESH What is a membrane potential? - correct answer Difference in charge inside/outside the cell membrane What is electrical potential? - correct answer When opposite charges are separated they have the potential to do work if allowed to come together What 2 ways can electrical force increase? - correct answer Quantity of charge, decreased charge separation What is the RMP of a typical neuron? - correct answer -70mV Is it more positive or more negative inside the cell? - correct answer More NEGGY What acts as a great insulator in the cell? - correct answer Lipids (increase resistance) What is the definition of current? - correct answer Movement of charges How to decrease resistance? - correct answer Open ion channels What is Ohm's Law? - correct answer I=V/R Is the vast majority of ECF and ICF positive, negative, or neutral? - correct answer Neutral If the majority of ECF/ICF is neutral, what causes the membrane potential?? - correct answer Small "shell" of ions against the PM What 2 things do the RMP depend on? - correct answer Difference in ion concentration between ECF/ICF, permeability of membrane to various ions What is step 1 of the membrane potential? - correct answer Na/K ATPase pumps set up/maintain Na/K concentration gradient How much Na is inside/outside the cell (at RMP)? - correct answer 15mM/150mM How much K is inside/outside the cell (at RMP)? - correct answer 150mM/5mM What is the definition of equilibrium potential? - correct answer Potential that opposes net diffusion of that ion through the PM What is the simplified Nernst equation? - correct answer Eion=61/Z log (conc out/conc in) How much does the Na/K pump contribute to the RMP? - correct answer 4mV How many Na/K do the Na/K pumps move in/out of the cell at once? - correct answer 3Na/2K What is step 2 of the RMP? - correct answer Greater net movement of K than Na makes RMP more negative on inside Why is there greater net movement of K than Na? - correct answer More K leak channels are open What two ways are K and Na moved into and out of the cell? - correct answer K leaks out, Na leaks in, K is pumped in, Na is pumped out What is the difference between equilibrium and steady state? - correct answer Equilibrium: no net flux, no energy required, can be either concentration equilibrium OR pressure/force equilibrium Steady state: concentrations are ALWAYS different, energy required