Question 1

The sympathetic division of the autonomic nervous system is arranged so that it acts largely as a unit,whereas the components of the parasympathetic division generally act as discrete, independent components.

Accepted Answer

A) True 
 B)False

Question 2

During which of the following phases is K⁺ permeability greater than at rest?

Accepted Answer

A)  During the after-hyperpolarization phase of an AP
B)  During vesicular release of neurotransmitter from the presynaptic neuron
C)  During the repolarizing phase of an AP
D)  During the depolarizating phase of an AP
E)  None of these,K⁺ permeability is greatest at rest

Question 3

Postganglionic neuron cell bodies of the autonomic nervous system have which category of neurotransmitter receptor?

Accepted Answer

A)  Adrenergic receptors
B)  Serotonin receptors
C)  Muscarinic acetylcholine receptors
D)  Nicotinic acetylcholine receptors
E)  Dopamine receptors

Question 4

Which best describes temporal summation?

Accepted Answer

A)  A synapse is stimulated a second time before the effect of a first stimulus at the synapse has terminated.
B)  It only refers to addition of EPSPs.
C)  Two synapses on different regions of a cell are stimulated at the same time.
D)  It always brings a postsynaptic cell to threshold.
E)  The size of an EPSP depends on the size of the stimulus.

Question 5

Inside a neuron,calcium binding sites are likely found on

Accepted Answer

A)  smooth endoplasmic reticulum.
B)  kinesin proteins.
C)  proteins associated with synaptic vesicles.
D)  dyenin proteins.
E)  lysosomal proteins.

Question 6

Which of the following kinds of neurons are NOT generally cholinergic?

Accepted Answer

A)  Somatic motor neurons
B)  Postganglionic sympathetic neurons
C)  Postganglionic parasympathetic neurons
D)  Preganglionic sympathetic neurons
E)  Preganglionic parasympathetic neurons

Question 7

Which of the following statements concerning the properties of action potentials is TRUE?

Accepted Answer

A)  The rate of propagation of an action potential down an axon is independent of stimulus strength.
B)  Action potentials can undergo summation.
C)  A supra-threshold stimulus can stimulate an action potential during the absolute refractory period.
D)  Action potentials generally propagate from the axon terminal toward the axon hillock.
E)  Increasing the size of a stimulus will increase the amplitude of an action potential.

Question 8

Neuronal axons typically have abundant

Accepted Answer

A)  voltage-gated channels for Na⁺ that open in response to depolarization.
B)  voltage-gated channels for K⁺ that open in response to hyperpolarization.
C)  ligand-gated channels for Na⁺.
D)  ligand-gated channels for K⁺.
E)  voltage-gated channels for Ca²⁺.

Question 9

Acetylcholine is the main neurotransmitter released by

Accepted Answer

A)  preganglionic sympathetic neurons and cells of the adrenal medulla.
B)  cells of the adrenal medulla and postganglionic parasympathetic neurons.
C)  motor neurons and postganglionic sympathetic neurons.
D)  preganglionic sympathetic neurons and postganglionic sympathetic neurons.
E)  preganglionic sympathetic neurons and motor neurons.

Question 10

You are studying the role of a newly discovered neurotransmitter.  You find that there are receptors for this neurotransmitter on interneurons in the brain and that when it binds,it causes the opening of K⁺ channels.  What can we expect of the postsynaptic cells under influence of this neurostransmitter?

Accepted Answer

A)  The postsynaptic cell will immediately undergo an action potential.
B)  The postsynaptic cell will undergo an IPSP.
C)  The postsynaptic cell will undergo an EPSP.
D)  There will be no change to the membrane potential in the postsynaptic cell.

Question 11

Which of the following statements about EPSPs is FALSE?

Accepted Answer

A)  They are produced by the opening of ligand-gated sodium channels.
B)  They transmit signals over relatively short distances.
C)  They depolarize postsynaptic cell membranes.
D)  They are able to summate.
E)  They are always the same amplitude.

Question 12

The regions of myelinated axon membrane that have the highest permeability to ions are the

Accepted Answer

A)  ganglia.
B)  nodes of Ranvier.
C)  synaptic membranes.
D)  glial cells.
E)  pia mater.

Question 13

Dorsal root ganglia contain the cell bodies of efferent neurons.

Accepted Answer

A) True 
 B)False

Question 14

The lipid portion of a cell's plasma membrane constitutes a barrier to current.

Accepted Answer

A) True 
 B)False

Question 15

Which is one of the most abundant excitatory neurotransmitters in the CNS?

Accepted Answer

A)  Glutamate
B)  Dopamine
C)  Norepinephrine
D)  Gamma-aminobutyric acid (GAB
A)  
E)  Endorphin

Question 16

At an excitatory chemical synapse between two neurons

Accepted Answer

A)  there is increased permeability of the postsynaptic cell to both Na⁺ and K⁺.
B)  a small hyperpolarization of the postsynaptic membrane occurs when the synapse is activated.
C)  an action potential in the presynaptic neuron always causes an action potential in the postsynaptic neuron.
D)  excitation occurs because K⁺ enters the postsynaptic cell.
E)  action potentials spread through gap junctions between cells.

Question 17

The portion of the peripheral nervous system that is composed of nerve fibers that innervate skeletal muscle is called the

Accepted Answer

A)  afferent nervous system.
B)  sympathetic nervous system.
C)  parasympathetic nervous system.
D)  somatic motor nervous system.
E)  autonomic nervous system.

Question 18

If a graded potential on a dendrite results in a 5mV depolarization,the depolarization at the axon hillock of the axon might be less than 5mV.

Accepted Answer

A) True 
 B)False

Question 19

The basal nuclei are important subcortical nuclei in the cerebrum.

Accepted Answer

A) True 
 B)False

Question 20

Which describes the response of the voltage-gated channels when an axon is stimulated to threshold?

Accepted Answer

A)  K⁺ channels open before the Na⁺ channels.
B)  Na⁺ channels are activated and then inactivated.
C)  K⁺ channels open at the same time as the Na⁺ channels.
D)  K⁺ channels are opened when Na⁺ binds to the channel.
E)  K⁺ influx causes Na⁺ channels to inactivate.

Exam 6: Neuronal Signaling and the Structure of the Nervous System

At an excitatory chemical synapse between two neurons

Correct Answer
verified

The basal nuclei are important subcortical nuclei in the cerebrum.

Correct Answer
verified

If a graded potential on a dendrite results in a 5mV depolarization,the depolarization at the axon hillock of the axon might be less than 5mV.

Correct Answer
verified

Acetylcholine is the main neurotransmitter released by

Correct Answer
verified

During which of the following phases is K⁺ permeability greater than at rest?

Correct Answer
verified

Dorsal root ganglia contain the cell bodies of efferent neurons.

Correct Answer
verified

The regions of myelinated axon membrane that have the highest permeability to ions are the

Correct Answer
verified

The sympathetic division of the autonomic nervous system is arranged so that it acts largely as a unit,whereas the components of the parasympathetic division generally act as discrete, independent components.

Correct Answer
verified

The portion of the peripheral nervous system that is composed of nerve fibers that innervate skeletal muscle is called the

Correct Answer
verified

Which best describes temporal summation?

Correct Answer
verified

Inside a neuron,calcium binding sites are likely found on

Correct Answer
verified

Which of the following kinds of neurons are NOT generally cholinergic?

Correct Answer
verified

Which of the following statements about EPSPs is FALSE?

Correct Answer
verified

Neuronal axons typically have abundant

Correct Answer
verified

Which describes the response of the voltage-gated channels when an axon is stimulated to threshold?

Correct Answer
verified

Which of the following statements concerning the properties of action potentials is TRUE?

Correct Answer
verified

The lipid portion of a cell's plasma membrane constitutes a barrier to current.

Correct Answer
verified

Postganglionic neuron cell bodies of the autonomic nervous system have which category of neurotransmitter receptor?

Correct Answer
verified

Which is one of the most abundant excitatory neurotransmitters in the CNS?

Correct Answer
verified

Correct Answer
verified

Exam 6: Neuronal Signaling and the Structure of the Nervous System

At an excitatory chemical synapse between two neurons

Correct AnswerverifiedShow Answer

The basal nuclei are important subcortical nuclei in the cerebrum.

Correct AnswerverifiedShow Answer

If a graded potential on a dendrite results in a 5mV depolarization,the depolarization at the axon hillock of the axon might be less than 5mV.

Correct AnswerverifiedShow Answer

Acetylcholine is the main neurotransmitter released by

Correct AnswerverifiedShow Answer

During which of the following phases is K⁺ permeability greater than at rest?

Correct AnswerverifiedShow Answer

Dorsal root ganglia contain the cell bodies of efferent neurons.

Correct AnswerverifiedShow Answer

The regions of myelinated axon membrane that have the highest permeability to ions are the

Correct AnswerverifiedShow Answer

The sympathetic division of the autonomic nervous system is arranged so that it acts largely as a unit,whereas the components of the parasympathetic division generally act as discrete, independent components.

Correct AnswerverifiedShow Answer

The portion of the peripheral nervous system that is composed of nerve fibers that innervate skeletal muscle is called the

Correct AnswerverifiedShow Answer

Which best describes temporal summation?

Correct AnswerverifiedShow Answer

Inside a neuron,calcium binding sites are likely found on

Correct AnswerverifiedShow Answer

Which of the following kinds of neurons are NOT generally cholinergic?

Correct AnswerverifiedShow Answer

Which of the following statements about EPSPs is FALSE?

Correct AnswerverifiedShow Answer

Neuronal axons typically have abundant

Correct AnswerverifiedShow Answer

Which describes the response of the voltage-gated channels when an axon is stimulated to threshold?

Correct AnswerverifiedShow Answer

Which of the following statements concerning the properties of action potentials is TRUE?

Correct AnswerverifiedShow Answer

The lipid portion of a cell's plasma membrane constitutes a barrier to current.

Correct AnswerverifiedShow Answer

Postganglionic neuron cell bodies of the autonomic nervous system have which category of neurotransmitter receptor?

Correct AnswerverifiedShow Answer

Which is one of the most abundant excitatory neurotransmitters in the CNS?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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