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Electrical Properties of the Neuron

Quiz by OASIS

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22 questions
Show answers
  • Q1
    A membrane potential across the membrane of a neuron is possible because of
    The hydrophilic core of the membrane
    A balance between a concentration gradient and electrical gradient
    The hydrophobic outer regions of the membrane
    Equal concentrations of ions on each side of the cell membrane
    30s
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  • Q2
    The amount of electrical force needed to balance the diffusion force is
    The concentration gradient
    Described by the Goldman Hodgkin Katz equation
    The equilibrium potential
    The diffusion potential
    30s
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  • Q3
    For most neurons, which ion does NOT contribute to the resting membrane potential?
    Sodium
    Calcium
    Potassium
    Magnesium
    30s
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  • Q4
    Which of the following is true of the resting membrane potential?
    Changing the permeability of the membrane to particular ions does not change the membrane potential
    The resting membrane potential lies close to the equilibrium potential for sodium
    At rest, there is a relatively low permeability for potassium in neurons
    Potassium is the primary ion determining the resting membrane potential
    30s
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  • Q5
    What types of ion channels are found in the membranes of neurons?
    All of the above
    Ligand-gated channels
    Passive channels
    Voltage-gated channels
    30s
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  • Q6
    Graded potentials that are depolarizing postsynaptic potentials are
    IPSPs
    Inhibitory in nature
    Caused by the opening of potassium or chloride channels
    EPSPs
    30s
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  • Q7
    Graded potentials usually travel the entire length of long axons
    FALSE
    TRUE
    30s
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  • Q8
    Which 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 hyperpolarization
    The convergence of a depolarizing and hyperpolarizing graded potential can double the effect
    It occurs at a single synapse
    Relies on the frequency of incoming action potentials
    30s
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  • Q9
    The primary source of depolarization in an action potential is provided by
    Voltage gated potassium channels
    Na+/K+ ATPase pump
    Passive leakage potassium channels
    Voltage gated sodium channels
    30s
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  • Q10
    Which of the following is NOT true regarding refractory periods?
    They are created because voltage gated sodium channels are still open
    They help to insure that action potentials are primarily unidirectional
    A second stimulus can generate another action potential during the relative refractory period, if the stimulus is large enough
    They allow a signal to be antidromic if stimulated in the middle of an axon
    30s
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  • Q11
    The resting membrane potential of -70mV is kept by all of the following except which?
    Leak channels
    Modality gated channels
    Na+/K+ pump
    High concentrations of anions inside the cell
    30s
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  • Q12
    Binding 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.
    FALSE
    TRUE
    30s
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  • Q13
    Synaptic vesicles are found in which of the following types of axonal transport?
    Slow
    Quick
    Intermediate
    Fast
    30s
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  • Q14
    Astrocytes can perform all of the following functions except which?
    Scavenge K+ in the extracellular environment
    Regulates ionic environment around neurons
    Phagocytize dead
    Help form blood brain barrier
    30s
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  • Q15
    In sensory neurons the region closest to the receptor with a high density of Na+ channels is called what?
    Refractory period
    Axon hillock
    Receptor zone
    End zone
    30s
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  • Q16
    Action potentials could spread up and down the axon if there was no refractory period.
    False
    True
    30s
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  • Q17
    An 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 intensity
    Saltatrory conduction
    Propagation
    Generated conduction
    30s
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  • Q18
    Which of the following is a gliotransmitter that can be considered excitatory?
    ATP
    K+
    Glutamate
    GABA
    30s
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  • Q19
    Which of the following helps return the axon to resting potential (after hyperpolarization) by actively transporting of ions out of the cell?
    Voltage gated K+ channels
    Na+/K+ Pump
    Na+/Cl- Pump
    Ca++ leak channels
    30s
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  • Q20
    At resting potential, the membrane potential is -70mV, because the inner cell is closer to which ions equilibrium potential?
    K+
    Cl-
    Na+
    Ca++
    30s
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