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Chapter 13 Quiz
Return to Animal Physiology 4e Student Resources
Chapter 13 Quiz
Quiz Content
*
not completed
.
Which substance is most directly responsible for exocytosis of synaptic vesicles?
Na
+
correct
incorrect
Acetylcholine
correct
incorrect
K
+
correct
incorrect
Ca
2+
correct
incorrect
*
not completed
.
Which statement regarding chemical synapses is true?
Chemical synapses are only excitatory.
correct
incorrect
Chemical synapses transmit information in two directions.
correct
incorrect
Chemical synapses have high plasticity.
correct
incorrect
Pre- and postsynaptic currents are always similar.
correct
incorrect
*
not completed
.
What effect would injecting a leg muscle with a drug that binds to and disables acetylcholinesterase have on that leg?
Delayed paralysis
correct
incorrect
Immediate tetany
correct
incorrect
Tetany once the leg muscle was contracted
correct
incorrect
Paralysis once the leg muscle was contracted
correct
incorrect
*
not completed
.
Ligand-gated channels on the postsynaptic membrane open and K
+
and Na
+
both move through these channels in opposite directions. Why then do we measure depolarization on the postsynaptic membrane?
Na
+
has a much stronger driving force into the cell.
correct
incorrect
K
+
has a much stronger driving force into the cell.
correct
incorrect
Na
+
has a much stronger driving force out of the cell.
correct
incorrect
K
+
has a much stronger driving force out of the cell.
correct
incorrect
*
not completed
.
The main ion responsible for the EPSP is
Na
+
.
correct
incorrect
K
+
.
correct
incorrect
Cl
–
.
correct
incorrect
Ca
2+
.
correct
incorrect
*
not completed
.
The limiting factor in the synthesis of acetylcholine is the speed at which
acetyl groups are formed.
correct
incorrect
vesicles are formed.
correct
incorrect
choline is recycled.
correct
incorrect
vesicles release choline.
correct
incorrect
*
not completed
.
The protein responsible for triggering the actual release of neurotransmitter at the synapse is
synaptotagmin.
correct
incorrect
SNARE.
correct
incorrect
dynamin.
correct
incorrect
sytaxin.
correct
incorrect
*
not completed
.
Epinephrine is
excitatory.
correct
incorrect
inhibitory.
correct
incorrect
simultaneously excitatory and inhibitory.
correct
incorrect
either excitatory or inhibitory.
correct
incorrect
*
not completed
.
Which statement regarding vertebrate neurotransmitters is true?
Most synapses (numerically) in the CNS use peptide neurotransmitters.
correct
incorrect
In the CNS, many receptors for biogenic amines mediate fast ionic responses.
correct
incorrect
Biogenic amines are found in almost all neurons in the CNS.
correct
incorrect
A neuroactive peptide may be co-released with one or more small-molecule neurotransmitters and may function as a cotransmitter.
correct
incorrect
*
not completed
.
Which statement regarding metabotropic receptors is true?
They can directly open or close ion channels.
correct
incorrect
They always activate a G protein.
correct
incorrect
They use no second messengers.
correct
incorrect
They mediate membrane voltage changes via slow postsynaptic potentials.
correct
incorrect
*
not completed
.
Which statement about the neuromuscular junction acetylcholine (Ach) receptor is
false
?
The probability an ACh channel will open depends on ACh concentration.
correct
incorrect
The synaptic current is the sum of the net ionic currents through all activated ACh receptors.
correct
incorrect
The opening of the ACh receptor is all-or-none.
correct
incorrect
The probability that an ACh channel will open depends on membrane voltage.
correct
incorrect
*
not completed
.
Which protein
cannot
contact a G protein directly?
Protein kinase C
correct
incorrect
Potassium channel
correct
incorrect
Phospholipase C
correct
incorrect
Adenylyl cyclase
correct
incorrect
*
not completed
.
During presynaptic inhibition, a(n)
metabotropic response reduces the number of action potentials reaching the synapse.
correct
incorrect
metabotropic response reduces the amount of calcium entering the nerve terminus.
correct
incorrect
ionotropic response reduces the number of action potentials reaching the synapse.
correct
incorrect
ionotropic response reduces the amount of calcium entering the nerve terminus.
correct
incorrect
*
not completed
.
How often does a neuron's output equal its input?
All the time
correct
incorrect
Most of the time
correct
incorrect
Seldom
correct
incorrect
Never
correct
incorrect
*
not completed
.
What is the relationship between synaptic facilitation and behavioral sensitization?
Synaptic facilitation is a short term response and behavioral sensitization is a long term response.
correct
incorrect
Synaptic facilitation is related to the sensory system and behavioral sensitization is related to the motor system.
correct
incorrect
Synaptic facilitation underlies behavioral sensitization.
correct
incorrect
They are both fundamentally the same thing.
correct
incorrect
*
not completed
.
In
Aplysia
, the result of sensitization at the synapse is a(n)
decrease in the amount of neurotransmitter per impulse.
correct
incorrect
increase in the number of impulses per second.
correct
incorrect
increase in the amount of neurotransmitter per impulse.
correct
incorrect
decrease in the number of impulses per second.
correct
incorrect
*
not completed
.
What is the mechanistic explanation for sensitization?
Increase in sodium flux
correct
incorrect
Increase in potassium flux
correct
incorrect
Decrease in potassium flux
correct
incorrect
Increase in calcium flux
correct
incorrect
*
not completed
.
Calmodulin binds to _______ and becomes activated.
G protein
correct
incorrect
Ca
2+
correct
incorrect
protein kinase C
correct
incorrect
adenylyl cyclase
correct
incorrect
*
not completed
.
The induction of long-term potentiation occurs in the
presynaptic neuron.
correct
incorrect
synapse.
correct
incorrect
postsynaptic neuron.
correct
incorrect
motor neuron.
correct
incorrect
*
not completed
.
Which statement best describes long-term potentiation?
More sodium entering the postsynaptic membrane per presynaptic action potential
correct
incorrect
More neurotransmitter released per action potential
correct
incorrect
More action potentials sent per second
correct
incorrect
More calcium released per action potential
correct
incorrect
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