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Have-a-Java Quiz 7 - Nervous System (Part II):
 
1. A depolarizing graded potential (GP) leads to entry into the neuron of a small number of:
    A) sodium ions
    B) potassium ions
    C) chloride ions
    D) hydrogen ions

 
2. The entry of positive ions into a neuron leads to a change in resting potential called:
    A) repolarization
    B) hyperpolarization
    C) depolarization
    D) polarization

 
3. The upstroke of an action potential is caused by:
    A) influx of positive ions
    B) influx of negative ions
    C) efflux of positive ions
    D) efflux of negative ions

 
4. The downstroke of an action potential is caused by:
    A) influx of positive ions
    B) influx of negative ions
    C) efflux of positive ions
    D) efflux of negative ions

 
5. All action potentials in a given neuron:
    A) are of the same magnitude
    B) are of the same duration
    C) occur after threshold is reached
    D) all of the above

 
6. Inhibition (hyperpolarization) of a neuron is most likely to result from
    A) entry of Na+ to neuron
    B) entry of K+ to neuron
    C) entry of Cl- to neuron
    D) entry of H+ to neuron



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