Electrical Properties of the Neuron
Quiz by OASIS
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22 questions
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- Q1A membrane potential across the membrane of a neuron is possible because ofThe hydrophilic core of the membraneA balance between a concentration gradient and electrical gradientThe hydrophobic outer regions of the membraneEqual concentrations of ions on each side of the cell membrane30sEditDelete
- Q2The amount of electrical force needed to balance the diffusion force isThe concentration gradientDescribed by the Goldman Hodgkin Katz equationThe equilibrium potentialThe diffusion potential30sEditDelete
- Q3For most neurons, which ion does NOT contribute to the resting membrane potential?SodiumCalciumPotassiumMagnesium30sEditDelete
- Q4Which of the following is true of the resting membrane potential?Changing the permeability of the membrane to particular ions does not change the membrane potentialThe resting membrane potential lies close to the equilibrium potential for sodiumAt rest, there is a relatively low permeability for potassium in neuronsPotassium is the primary ion determining the resting membrane potential30sEditDelete
- Q5What types of ion channels are found in the membranes of neurons?All of the aboveLigand-gated channelsPassive channelsVoltage-gated channels30sEditDelete
- Q6Graded potentials that are depolarizing postsynaptic potentials areIPSPsInhibitory in natureCaused by the opening of potassium or chloride channelsEPSPs30sEditDelete
- Q7Graded potentials usually travel the entire length of long axonsFALSETRUE30sEditDelete
- Q8Which of the following is true regarding spatial summation of postsynaptic potentials?Allows for EPSPs or IPSPs to be combined to produce a greater depolarization or hyperpolarizationThe convergence of a depolarizing and hyperpolarizing graded potential can double the effectIt occurs at a single synapseRelies on the frequency of incoming action potentials30sEditDelete
- Q9The primary source of depolarization in an action potential is provided byVoltage gated potassium channelsNa+/K+ ATPase pumpPassive leakage potassium channelsVoltage gated sodium channels30sEditDelete
- Q10Which of the following is NOT true regarding refractory periods?They are created because voltage gated sodium channels are still openThey help to insure that action potentials are primarily unidirectionalA second stimulus can generate another action potential during the relative refractory period, if the stimulus is large enoughThey allow a signal to be antidromic if stimulated in the middle of an axon30sEditDelete
- Q11The resting membrane potential of -70mV is kept by all of the following except which?Leak channelsModality gated channelsNa+/K+ pumpHigh concentrations of anions inside the cell30sEditDelete
- Q12Binding of neurotransmitters to receptors on a postsynaptic cell opens ligand-gated ion channels, locally changing the resting membrane potential of the cell and always resulting in depolarization of the postsynaptic cell.FALSETRUE30sEditDelete
- Q13Synaptic vesicles are found in which of the following types of axonal transport?SlowQuickIntermediateFast30sEditDelete
- Q14Astrocytes can perform all of the following functions except which?Scavenge K+ in the extracellular environmentRegulates ionic environment around neuronsPhagocytize deadHelp form blood brain barrier30sEditDelete
- Q15In sensory neurons the region closest to the receptor with a high density of Na+ channels is called what?Refractory periodAxon hillockReceptor zoneEnd zone30sEditDelete
- Q16Action potentials could spread up and down the axon if there was no refractory period.FalseTrue30sEditDelete
- Q17An action potential propagates down an axon and appears to quickly jump from node (of Ranview) to node, and this is known as what?Threshold stimulus intensitySaltatrory conductionPropagationGenerated conduction30sEditDelete
- Q18Which of the following is a gliotransmitter that can be considered excitatory?ATPK+GlutamateGABA30sEditDelete
- Q19Which of the following helps return the axon to resting potential (after hyperpolarization) by actively transporting of ions out of the cell?Voltage gated K+ channelsNa+/K+ PumpNa+/Cl- PumpCa++ leak channels30sEditDelete
- Q20At resting potential, the membrane potential is -70mV, because the inner cell is closer to which ions equilibrium potential?K+Cl-Na+Ca++30sEditDelete