Physioex 3: Neurophysiology question with complete solution graded A+ 2023

Physioex 3: Neurophysiology question with complete solution graded A+ 2023What is the approximate concentration of K+ inside a typical cell (intracellular concentration)? - correct answer 150 mM What is the approximate concentration of K+ outside a cell (extracellular concentration)? - correct answer 5 mM What is the approximate concentration of Na+ inside a cell (intracellular concentration)? - correct answer 5 mM What is the approximate concentration of Na+ outside a cell (extracellular concentration)? 150 mM - correct answer 150 mM What is the polarity of the resting membrane potential (voltage)? - correct answer negative What does it mean that the voltage just inside the membrane is negative? - correct answer There are more negative charges than positive charges just inside the membrane The membrane of most cells, including neurons, contains passive, open, K + leak channels. Given the normal K+ concentrations and the resultant concentration gradient, which direction would K + be expected to move (diffuse) through these leak channels? - correct answer outside the cell Predict what will happen to the resting membrane potential if the extracellular K+ concentration is increased - correct answer the resting membrane potential will become less negative What effect does increasing extracellular K+ have on the net diffusion of K+ out of the cell? - correct answer It decreases the net diffusion of K+ .