. Given the following concentrations: K* ICF 140 mM Na* 12 mM 145 mM 120 mM CF 12 mM ECF 3 mM a) Calculate the equilibrium potentials of K, Na" and Cl using the Nernst equation. EK = ENa= EC = %3D %3D b) In the case above, if the membrane is permeable only to K, what would be the predicted membrane potential? c) If the membrane is equally permeable to K* and Na", and impermeable to all other ions, what would be the predicted membrane potential?

factors responsible for a negative resting membrane potential include: check all that apply:   a. Na K pump  b. different carrier proteins  c. uneven distribution of ions  d. difference in permeability of ions  e. high potassium concentration in ECF

Q1. A loss-of-function mutation in the ion channel responsible for thegeneration of end-plate potentials results in a diminished permeabilityof the ion channel.a) What are the likely functional consequences of this mutation? Theanswer should provide a detailed description of the processes that arelikely to be affected.

1.A poison causes a drastic rise inE value with stimulation of the membrane.Thereafter membrane is slow to return towards resting membrane potential and levels off several millivolts above the threshold potential. This poison has likely affect which feature of the membrane? a) voltage gated na+ channels. b) voltage gated K+ channels. c) Na+/K+ Atp pump 2. All cell membrane demonstrate action potential if stimulated enough? True/False. 3. how many peaks are there in a compound action potential? a)2.      b)4      c)6      d)8 4. Increasing the ionic concentration in the salt bridge results in E value increase to a point after which it plateeus. This is evidence brownian movement at work in the ionic solution that is keeping from energy flowing through the bridge with the fidelity that is seen in the metal bridge? True/ False 5. All cell membrane demonstrate action potential if stimulated enough? True or False.