Compounds classified as ______ alter synaptic transmission by changing neurotransmitter receptor numbers or affecting the breakdown and/or removal of neurotransmitter.
A.
excitatory neurotransmitters
B.
neurohormones
C.
neuromodulators
D.
inhibitory neurotrasnmitters
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Question 2) In order for local potentials to trigger an action potential, the membrane must reach a level called the ______.
A.
maximum potential
B.
spike potential
C.
threshold
D.
resting membrane potential
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Question 3) Identify the correct sequence of information in a chemical synapse.
A.
Postsynaptic membrane; synaptic cleft; presynaptic terminal
B.
Synaptic cleft; presynaptic terminal; postsynaptic membrane
C.
Presynaptic terminal; postsynaptic membrane; synaptic cleft
D.
Presynaptic terminal; synaptic cleft; postsynaptic membrane
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Question 4) Synapses in which gap junctions allow ions to diffuse quickly from cell to cell are called ______ synapses.
A.
chemical
B.
electrical
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Question 5) Identify the mechanisms by which neuromodulators alter synaptic transmission.
Changing neurotransmitter receptor numbers
Increasing amounts of neurotransmitter released
Affecting breakdown of neurotransmitters
Affecting the removal of neurotransmitters
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Question 6) Identify the phases of an action potential.
afterpotential
depolarization
hyperpolarization
repolarization
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Question 7) Nervous tissue of the CNS that is composed primarily of myelinated axons is often referred to as ______ matter.
A.
white
B.
light
C.
gray
D.
dark
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Question 8) Identify the characteristics of action potentials.
Multiple stimuli can create larger action potentials, and fewer stimuli can create smaller action potentials.
The strength of the stimulus determines the frequency of the action potentials.
The strength of the stimulus determines the magnitude of the action potential.
They are all-or-none
They are propagated in a non-decremental fashion.
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Question 9) Protein synthesis in neurons occurs in
A. terminal boutons.
B. axons.
C. dendrites.
D. cell bodies or soma.
E. node of Ranvier.
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Question 10) The gray matter of the cerebrum is composed of neuron cell bodies and makes up both the ______ and the ______.
A.
cortex ; deep cerebral nuclei
B.
cerebral tracts ; cortex
C.
cortex ; white matter
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