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ch 4 quiz

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
A change in membrane potential in which the charge is becoming less negative than resting potential is called   Depolarization  
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Ependymal cells   Secrete cerebrospinal fluid in the ventricles of the brain  
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What is one of the three functions of the cerebrospinal fluid in the human body?   Mechanical protection of the central nervous system  
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Which type of potential results from the opening of Na+ channels?   Excitatory postsynaptic potential  
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An action potential results in a change in the membrane potential of a nerve cell from resting potential if the potential changes to   -55 mV  
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During the rising phase of an action potential,   Voltage-gated Na+ channels open.  
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Exocytosis of neurotransmitter into the synaptic cleft is triggered by an influx of ______ in response to the arrival of an action potential in the axon terminal.   Ca2  
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One of the major inhibitory neurotransmittors in the CNS is   gamma amino butyric acid (GABA)  
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When a nerve fiber is polarized, the concentration of   sodium ions is higher on the outside of its membrane and potassium ions is higher on the inside.  
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An infant's responses to stimuli are coarse and undifferentiated because its nerve fibers   are not completely myelinated  
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