Wingfield questions for NPB Midterm 1

Wingfield questions for NPB Midterm 1 - Wingfield questions...

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Wingfield questions for NPB Midterm 1, Oct. 15, 2008. 3. A resting membrane potential is partially maintained by: a. Passive sodium ion channels. b. Passive potassium ion channels. c. Sodium‐potassium ion pump. d. None of the above. e. All of the above. 4. A graded potential has the following properties: a. Shows an all‐or‐none depolarization. b. Always has the same duration. c. Can vary in duration. d. Can vary in amplitude. e. c and d. 5. The refractory period of a depolarized neuron involves: a. Reduced potassium ion channels. b. Loss of graded potentials in the cell body. c. Inactivated sodium channel. d. Opening of calcium channels. e. Closing of calcium channels. 6. Action potentials in axons are initiated in which part of the neuron? a. Axon hillock. b. Dendrites. c. Cell nucleus. d. Synapse. e. Mitochondria. 7. Nodes of Ranvier in myelinated neurons affect action potentials in which way? a. Loss of ability to depolarize. b. Cause hyperpolarization. c. Slow down the rate of conduction. d. b and c.
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Wingfield questions for NPB Midterm 1 - Wingfield questions...

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