Skip to main content
United States
Jump To
Support
Register or Log In
Support
Register or Log In
Instructors
Browse Products
Getting Started
Students
Browse Products
Getting Started
Chapter 12 Quiz
Return to Animal Physiology 4e Student Resources
Chapter 12 Quiz
Quiz Content
*
not completed
.
The neuron converts an electrical signal to a chemical signal in the
dendrite.
correct
incorrect
presynaptic terminal.
correct
incorrect
cell body.
correct
incorrect
axon hillock.
correct
incorrect
*
not completed
.
Neurons that relay sensory signals to integrative centers of the CNS are called
interneurons.
correct
incorrect
afferent neurons.
correct
incorrect
synaptic neurons.
correct
incorrect
efferent neurons.
correct
incorrect
*
not completed
.
Which glial cells function as metabolic intermediaries between capillaries and neurons?
Schwann cells
correct
incorrect
Oligodendrocites
correct
incorrect
Astrocytes
correct
incorrect
Microglial cells
correct
incorrect
*
not completed
.
Which term best describes the movement of ions across a membrane?
Current
correct
incorrect
Voltage
correct
incorrect
Resistance
correct
incorrect
Capacitance
correct
incorrect
*
not completed
.
A decrease in the absolute value of the membrane potential toward zero is called
depolarization.
correct
incorrect
an action potential.
correct
incorrect
hyperpolarization.
correct
incorrect
a membrane potential.
correct
incorrect
*
not completed
.
Which of the following actively contributes to the cell's membrane potential?
Permeability to K
+
correct
incorrect
Permeability to Na
+
correct
incorrect
The overall resistance of the membrane
correct
incorrect
Electrogenic ion pumps
correct
incorrect
*
not completed
.
The time constant (τ) depends on the _______ of the membrane.
resistance
correct
incorrect
capacitance
correct
incorrect
resistance and voltage
correct
incorrect
resistance and capacitance
correct
incorrect
*
not completed
.
If a current pulse is generated on the membrane and creates a passive potential, which statement will be true?
The change in the membrane potential will increase as the distance from the current pulse increases.
correct
incorrect
The change in the membrane potential will decrease as the distance from the current pulse increases.
correct
incorrect
The change in the membrane potential will remain constant throughout the length of the membrane.
correct
incorrect
The change in the membrane potential will fluctuate depending on the strength of the initial current pulse.
correct
incorrect
*
not completed
.
The plasma membrane of a resting neuron is most permeable to which ion?
Na
+
correct
incorrect
K
+
correct
incorrect
Cl
–
correct
incorrect
Ca
2+
correct
incorrect
*
not completed
.
If ouabain was used to block Na
+
–K
+
-ATPase pumps,
Na
+
would go to equilibrium across the cell membrane.
correct
incorrect
the membrane potential would become more negative.
correct
incorrect
the concentration of K
+
would be equal on both sides of the membrane.
correct
incorrect
the cell would maintain steady state with a different membrane potential.
correct
incorrect
*
not completed
.
In a typical neuron, which ion is in passive equilibrium across the cell membrane?
Na
+
correct
incorrect
K
+
correct
incorrect
Cl
–
correct
incorrect
Both Na
+
and K
+
correct
incorrect
*
not completed
.
A stimulating depolarizing current that depolarizes the axon hillock just slightly negative to the threshold will
not change the overall membrane potential at all.
correct
incorrect
produce an action potential.
correct
incorrect
produce a very small action potential.
correct
incorrect
produce a temporary graded potential.
correct
incorrect
*
not completed
.
_______ channels govern the generation of an action potential.
Ligand-gated Na
+
correct
incorrect
Ligand-gated K
+
correct
incorrect
Voltage-gated Na
+
correct
incorrect
Voltage-gated K
+
correct
incorrect
*
not completed
.
Considering the cycle of an action potential, when is the permeability to K
+
at its greatest?
During the resting membrane potential
correct
incorrect
During the rising phase of the action potential
correct
incorrect
At the peak of the action potential
correct
incorrect
During the falling phase of the action potential
correct
incorrect
*
not completed
.
Which statement regarding the action potential is
false
?
In an extremely long axon, the action potential eventually will degrade.
correct
incorrect
During the "falling" phase, K
+
permeability increases.
correct
incorrect
During the "rising" phase, Na
+
moves into the neuron.
correct
incorrect
In the recovery phase, Na
+
channels are closed.
correct
incorrect
*
not completed
.
What allows the action potential to return to a repolarized state?
Voltage-gated Na
+
channels become inactivated.
correct
incorrect
Voltage-gated K
+
channels become inactivated.
correct
incorrect
Na
+
reaches equilibrium across the neural membrane and stops leaking in.
correct
incorrect
Voltage-gated Na
+
channels close.
correct
incorrect
*
not completed
.
Which statement regarding cardiac pacemaker cells is
false
?
They spontaneously generate action potentials.
correct
incorrect
The frequency of action potential generation can be modified by neural input.
correct
incorrect
The pacemaker cells are modified neural tissue.
correct
incorrect
They are connected to myocardium via gap junctions.
correct
incorrect
*
not completed
.
_______ are responsible for extending the time of the cardiac action potential relative to a neural action potential.
Slow Ca
2+
channels
correct
incorrect
Slow Na
+
channels
correct
incorrect
Slow K
+
channels
correct
incorrect
Voltage-gated Na
+
channels
correct
incorrect
*
not completed
.
Which character of neurons affects conduction velocity the
least
?
Axon diameter
correct
incorrect
Myelination
correct
incorrect
Axon length
correct
incorrect
Temperature
correct
incorrect
*
not completed
.
In myelinated axons, action potentials occur
all along the axon.
correct
incorrect
only at the internodes.
correct
incorrect
only at the initial segment of the axon.
correct
incorrect
only at the nodes of Ranvier.
correct
incorrect
Previous Question
Submit Quiz
Next Question
Reset
Exit Quiz
Review all Questions
Submit Quiz
Are you sure?
You have some unanswered questions. Do you really want to submit?
Back to top
Printed from , all rights reserved. © Oxford University Press, 2024
Select your Country