Answer Happy

7 0/1 point Suppose you have a neuron with the following starting concentrations of ions at 37 degrees C... [K+]outside = 5 mM [K+Jinside = 140 mM [Na+Jinside = 12 mM [Cl-Jinside = 5 mM = 145 mM 110 mM [Na+]outside [CI-]outside What is the membrane potential at equilibrium of this neuron if the membrane was 100 times more permeable to potassium than sodium and impermeable to chloride? X Correct Answer: -82 mV -89 mV -82 mV 82 mV 0 mV None of the above
Your lab partner was walking to class and has received a nasty series of bee stings from a mutant strain engineered to express a modified apamin venom. This engineered venom specifically targets potassium channels in the CNS. The pyramidal neurons in your partners cerebral cortex have received a dose of venom that results in a 25% reduction in potassium membrane permeability (pK). Assume you are studying a neuron in your partners cortex that happens to have the same properties as the one in questions 1-2.... Permeability of neuron at rest pK:pNa:pCl = 1:0.05:0.45 [K+]Out=5mM [K+]In=140mM [Na+]Out-145mM [Na+]In=12mM [CI-]Out=100mM [CI-]In=5mM Before the bee stung your partner, the resting membrane potential of the neuron was______? 62 mV -73 mV -55 mV -68 mV