N110 EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS GRADED A++

N110 EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS GRADED A++ Oligodendrocytes in the CNS produce ___ Myelin During the action potential, permeability to both Na+ and K+ ions increase. Although these ions flow in opposite directions, the currents don't cancel each other because K+ channels activate more slowly than Na+ channels If you increase the intracellular Cl- concentration in an axon, what effect would this have on the duration of the action potential? No effect One product of acetylcholine breakdown is ___ , which is transported back into the terminal. Choline In myasthenia gravis, the body produces antibodies directed against which of the following? Acetylcholine receptor A membrane protein that moves an ion across the membrane against its concentration gradient is called a ___. Transporter or pump If the extracellular Na+ is increased 50 mM, by how much (approximately) will the resting membrane potential change (give your answer in mV)? 0 mV True or False? If you apply ACh to a muscle cell that is voltage clamped at a membrane potential of -50 mV, the resulting current flow is due entirely to Na+ influx. False The poison tetrodotoxin blocks which channels? Voltage dependent Na+ channels The reversal potential of a MEPP is ___ mV (give a number) 0 mV Which of the following is true about the threshold potential? It can be reached by a sum of EPSPs Bernstein's hypothesis, which ultimately was disproved, predicted that during the action