PSYC 355 Final Exam Study Questions With Complete
Solutions
How does the sodium-potassium pump help maintain the resting
membrane potential?
A) Pumps potassium ions in and sodium ions out
B) Pumps sodium ions in and potassium ions out
C) Exchanges a sodium ion and a potassium ion for a calcium
ion
D) Uses calcium ions to pump sodium ions and potassium ions
against their concentration gradients
pumps potassium ions in and sodium ions out
The brain can differentiate between each sensory modality
because
A) the action potentials, sent along the same nerve tracts, get
sorted by the thalamus.
B) the action potentials for each modality are sent to separate
cortical areas.
C) each sense uses different neurotransmitters.
D) each sensory input, passing through the same lines, triggers
action potentials in a different pattern.
the action potentials for each modality are sent to separate
cortical areas
,How does tetrodotoxin (TTX) affect channels to block action
potentials?
A) TTX blocks leaky K+ channels.
B) TTX blocks Na+ channels.
C) TTX blocks Cl- channels.
D) TTX sensitizes Ca+ channels.
TTX blocks NA+ channels
Why do action potentials travel in only one direction?
A) The membrane just behind the action potential is refractory
due to inactivated potassium channels.
B) The membrane just behind the action potential is refractory
due to inactivated sodium channels.
C) Membrane proteins are destroyed when an action potential
fires and it takes time to replace them.
D) There is not enough sodium in the extracellular space after an
action potential has just fired.
the membrane just behind the action potential is refractory due
to inactivated sodium channels
Which of the following are the major charge carriers involved
neural communication?
A) Polar bonds
B) Phospholipid bilayers
C) Ions
D) Ionic bonds
ions
,An exogenous agonist
A) has the same effect on a channel as the native
neurotransmitter.
B) has a blocking effect on the native neurotransmitter.
C) binds directly to the native neurotransmitter.
D) causes an upregulation in receptor sites.
has the same effect on a channel as the native neurotransmitter
The dose at which a drug has a half-maximal response is termed
the
A) saturated dose.
B) therapeutic dose.
C) ED50.
D) LD50
ED50
What is resting membrane potential?
A) Difference in electrical charge across the membrane at rest
B) Generation and conduction of action potential at rest
C) Positive charge of the membrane at rest D) Isolation of the
cytosol from extracellular fluid
difference in electrical charge across the membrane at rest
Which factor other than the ionic concentration gradient
determines the equilibrium potential for an ion?
A) The permeability of the membrane for the ion
B) Sodium potassium pump
C) Electrical resistance
D) Electrical conductance
, the permeability of the membrane for the ion
In vesicular release of neurotransmitters, __________ molecules
help dock the vesicle on the presynaptic membrane and prepare
it for release.
A) exocytosis
B) synaptotagmin
C) SNARE
D) Ca+
SNARE
A manufactured drug that interacts with a particular type of
receptor in the brain is a(n) _______ ligand.
A) exogenous
B) endogenous
C) excitatory
D) inhibitory
exogenous
What is the term used to describe the mechanism for the
regulation of K+ by astrocytes?
A) Depolarization
B) Potassium spatial buffering
C) Blood-brain barrier
D) Goldman equation
potassium spatial buffering
Whether a synapse is excitatory or inhibitory is determined by
the
A) number of action potentials arriving at the presynaptic axon
Solutions
How does the sodium-potassium pump help maintain the resting
membrane potential?
A) Pumps potassium ions in and sodium ions out
B) Pumps sodium ions in and potassium ions out
C) Exchanges a sodium ion and a potassium ion for a calcium
ion
D) Uses calcium ions to pump sodium ions and potassium ions
against their concentration gradients
pumps potassium ions in and sodium ions out
The brain can differentiate between each sensory modality
because
A) the action potentials, sent along the same nerve tracts, get
sorted by the thalamus.
B) the action potentials for each modality are sent to separate
cortical areas.
C) each sense uses different neurotransmitters.
D) each sensory input, passing through the same lines, triggers
action potentials in a different pattern.
the action potentials for each modality are sent to separate
cortical areas
,How does tetrodotoxin (TTX) affect channels to block action
potentials?
A) TTX blocks leaky K+ channels.
B) TTX blocks Na+ channels.
C) TTX blocks Cl- channels.
D) TTX sensitizes Ca+ channels.
TTX blocks NA+ channels
Why do action potentials travel in only one direction?
A) The membrane just behind the action potential is refractory
due to inactivated potassium channels.
B) The membrane just behind the action potential is refractory
due to inactivated sodium channels.
C) Membrane proteins are destroyed when an action potential
fires and it takes time to replace them.
D) There is not enough sodium in the extracellular space after an
action potential has just fired.
the membrane just behind the action potential is refractory due
to inactivated sodium channels
Which of the following are the major charge carriers involved
neural communication?
A) Polar bonds
B) Phospholipid bilayers
C) Ions
D) Ionic bonds
ions
,An exogenous agonist
A) has the same effect on a channel as the native
neurotransmitter.
B) has a blocking effect on the native neurotransmitter.
C) binds directly to the native neurotransmitter.
D) causes an upregulation in receptor sites.
has the same effect on a channel as the native neurotransmitter
The dose at which a drug has a half-maximal response is termed
the
A) saturated dose.
B) therapeutic dose.
C) ED50.
D) LD50
ED50
What is resting membrane potential?
A) Difference in electrical charge across the membrane at rest
B) Generation and conduction of action potential at rest
C) Positive charge of the membrane at rest D) Isolation of the
cytosol from extracellular fluid
difference in electrical charge across the membrane at rest
Which factor other than the ionic concentration gradient
determines the equilibrium potential for an ion?
A) The permeability of the membrane for the ion
B) Sodium potassium pump
C) Electrical resistance
D) Electrical conductance
, the permeability of the membrane for the ion
In vesicular release of neurotransmitters, __________ molecules
help dock the vesicle on the presynaptic membrane and prepare
it for release.
A) exocytosis
B) synaptotagmin
C) SNARE
D) Ca+
SNARE
A manufactured drug that interacts with a particular type of
receptor in the brain is a(n) _______ ligand.
A) exogenous
B) endogenous
C) excitatory
D) inhibitory
exogenous
What is the term used to describe the mechanism for the
regulation of K+ by astrocytes?
A) Depolarization
B) Potassium spatial buffering
C) Blood-brain barrier
D) Goldman equation
potassium spatial buffering
Whether a synapse is excitatory or inhibitory is determined by
the
A) number of action potentials arriving at the presynaptic axon
