UMKC BIOLOGY 109 QUIZ 6 PROBLEM SETS
QUESTIONS WITH COMPLETE SOLUTIONS
A change in the membrane potential of a neuron from a value of
-70mV to a value of -60mV would be called: Correct Answer
Depolarization
A change in the membrane potential of a neuron from a value of
-70mV to a value of -80mV would be called: Correct Answer
hyperpolarization
Acetylcholine released into the junction between a motor neuron
and a skeletal muscle binds to a sodium channel and opens its.
The sodium channel is a: Correct Answer ligand-gated
sodium channel
Action potentials move along axons: Correct Answer more
rapidly in myelinated than in non-myelinated axons
An IPSP is: Correct Answer caused by an increase in the
permeability of the postsynaptic membrane to K+ and/or Cl-
Assume that a single IPSP has a negative magnitude of -0.5 mV
at the axon hillock, and that a single EPSP has a positive
magnitude of +0.5 mV. For a neuron with an initial membrane
potential of -70 mV, the net effect of the simultaneous arrival of
2 IPSPs and six EPSPs would be to move the membrane
potential to Correct Answer -68mV
Assume that a single IPSP has a negative magnitude of -0.5 mV
at the axon hillock, and that a single EPSP has a positive
, magnitude of +0.5 mV. For a neuron with an initial membrane
potential of -70 mV, the net effect of the simultaneous arrival of
6 IPSPs and two EPSPs would be to move the membrane
potential to Correct Answer -72mV
In a neuron, resting potential is maintained by maintaining a
gradient of: Correct Answer Both Potassium and Sodiums
ions
In a simple synapse, neurotransmitter chemicals are released by
Correct Answer the presynaptic membrane
In resting potential, an example of a cation that is more abundant
in the cytosol of a neuron than in the interstitial fluid outside the
neuron is: Correct Answer K+
Individuals who have suffered a brain injury and cannot form
any new lasting memories but can recall events that occurred
before their injury have most likely suffered damage to their:
Correct Answer hippocampus
Involuntary functions such as breathing are controlled mostly
by: Correct Answer brainstem
Long-term memory information processing requires that links
initially established in the hippocampus are replaces with
connections in the: Correct Answer cerebral cortex
Postsynaptic potentials:
A. directly result form the opening of voltage-gated ion channels
B. May be depolarizing or hyper polarizing
QUESTIONS WITH COMPLETE SOLUTIONS
A change in the membrane potential of a neuron from a value of
-70mV to a value of -60mV would be called: Correct Answer
Depolarization
A change in the membrane potential of a neuron from a value of
-70mV to a value of -80mV would be called: Correct Answer
hyperpolarization
Acetylcholine released into the junction between a motor neuron
and a skeletal muscle binds to a sodium channel and opens its.
The sodium channel is a: Correct Answer ligand-gated
sodium channel
Action potentials move along axons: Correct Answer more
rapidly in myelinated than in non-myelinated axons
An IPSP is: Correct Answer caused by an increase in the
permeability of the postsynaptic membrane to K+ and/or Cl-
Assume that a single IPSP has a negative magnitude of -0.5 mV
at the axon hillock, and that a single EPSP has a positive
magnitude of +0.5 mV. For a neuron with an initial membrane
potential of -70 mV, the net effect of the simultaneous arrival of
2 IPSPs and six EPSPs would be to move the membrane
potential to Correct Answer -68mV
Assume that a single IPSP has a negative magnitude of -0.5 mV
at the axon hillock, and that a single EPSP has a positive
, magnitude of +0.5 mV. For a neuron with an initial membrane
potential of -70 mV, the net effect of the simultaneous arrival of
6 IPSPs and two EPSPs would be to move the membrane
potential to Correct Answer -72mV
In a neuron, resting potential is maintained by maintaining a
gradient of: Correct Answer Both Potassium and Sodiums
ions
In a simple synapse, neurotransmitter chemicals are released by
Correct Answer the presynaptic membrane
In resting potential, an example of a cation that is more abundant
in the cytosol of a neuron than in the interstitial fluid outside the
neuron is: Correct Answer K+
Individuals who have suffered a brain injury and cannot form
any new lasting memories but can recall events that occurred
before their injury have most likely suffered damage to their:
Correct Answer hippocampus
Involuntary functions such as breathing are controlled mostly
by: Correct Answer brainstem
Long-term memory information processing requires that links
initially established in the hippocampus are replaces with
connections in the: Correct Answer cerebral cortex
Postsynaptic potentials:
A. directly result form the opening of voltage-gated ion channels
B. May be depolarizing or hyper polarizing
