BILD 2 Practice Questions for Week 3 Section

BILD 2 Practice Questions for Week 3 Section - e. The...

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TA: Lauren Herzog BILD 2: Week 3 Practice Problems 1) Sodium/Potassium-ATPase contributes to the neurons resting membrane potential. What is the direct contribution of this pump? a. 1 Na pumped out of cell for every 4 K pumped in b. 2 Na pumped into cell for every 3 K pumped in c. 3 Na pumped out of cell for every 2 K pumped in d. 5 Na pumped into cell for every 3 pumped out e. 3 Na pumped into cell for every 2 K pumped in 2) A change in the resting potential of a neuron would be associated with which of the following I. Influx of Clˉ II. Efflux of K III. Efflux of Glucose IV. Influx of Na a. II and IV only b. I, II, and IV only c. I and III only d. I and II only e. III only 3) What is responsible for the absolute refractory period in the neuron? a. The K channels are no longer able to open b. The plasma membrane is no longer permeable to ions c. The voltage gated sodium channels are unable to open and inactivated d. The extracellular concentrations of sodium are too low
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Unformatted text preview: e. The sodium/potassium pump is inactivated 4) If a certain toxin prevented the closing of voltage gated sodium channels, which of the following would occur? i. The sodium/potassium pump would be inactivated ii. The membrane would be unable to repolarize to the resting potential iii. The neuron would no longer be able to transmit action potentials iv. Voltage gated potassium channels would be unable to close a. i, ii, ii b. ii, iii, iv c. ii only d. iv only e. iii only 5) Which of the following occurrences will depolarize a neuron? a. Opening of potassium leak channels b. The activity of the sodium/potassium pump c. Closing of all channels and pumps in a cell d. Opening of voltage gated potassium channels e. Opening of voltage gated sodium channels 6) What channels are opening or closing at each point in this graph of an action potential? 7) Are neurons the only cells with a resting membrane potential?...
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BILD 2 Practice Questions for Week 3 Section - e. The...

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