Question 1

-The figure illustrates the Action Potential.What does "B" represent?

Accepted Answer

A)  repolarization
B)  depolarization
C)  local potential
D)  threshold
E)  afterpotentialF) A) and C)
G) D) and E)

Question 2

Chemical synapses are characterized by

Accepted Answer

A)  the release of neurotransmitter by the presynaptic terminal.
B)  connexons that connect the pre- and postsynaptic cells.
C)  the presence of receptors for neurotransmitters on the presynaptic terminal.
D)  the absence of gap junctions.
E)  receptors located only on the presynaptic terminal.F) A) and B)
G) A) and C)

Question 3

A neuron with several dendrites and a single axon would be called a ____________ neuron.

Accepted Answer

The answer of A neuron with several dendrites and a...

Question 4

Match the neuroglial cell with its function.
-oligodendrocyte

Accepted Answer

A)  influence function of blood-brain barrier
B)  macrophages in CNS
C)  produce cerebrospinal fluid
D)  form myelin sheath around axons in CNS
E)  form myelin sheath around part of the axon in the PNSF) A) and B)
G) C) and E)

Question 5

The strength of a stimulus is communicated through

Accepted Answer

A)  changes in the magnitude of the action potential.
B)  the frequency of the action potentials.
C)  the length of time action potentials are produced.
D)  both the frequency and the length of time action potentials are produced.E) All of the above
F) A) and D)

Question 6

What type of neuroglial cells provide support and nutrition to sensory ganglia in the PNS?

Accepted Answer

A)  Schwann cells
B)  microglia
C)  ependymal cells
D)  satellite cellsE) C) and D)
F) A) and D)

Question 7

In some cells,an afterpotential occurs because

Accepted Answer

A)  the sodium ions continue to enter the cell after depolarization is finished.
B)  there is prolonged,elevated permeability to potassium during repolarization.
C)  the sodium-potassium pump is actively exchanging ions across the membrane.
D)  the extracellular Na+ ion concentration is reduced.
E)  the permeability to sodium continues longer than necessary.F) A) and B)
G) None of the above

Question 8

Match the following concerning concentration differences across the plasma membrane.
-higher inside cell

Accepted Answer

A)  concentration of potassium
B)  concentration of sodium and chloride
C)  negatively charged proteins
D)  sodium/potassium pump
E)  plasma membrane is more permeable to this ion because of leak ion channelsF) A) and B)
G) All of the above

Question 9

What inhibitory neurotransmitter is blocked in strychnine poisoning?

Accepted Answer

A)  glycine
B)  acetylcholine
C)  glutamate
D)  adenosineE) None of the above
F) B) and D)

Question 10

A change in resting membrane potential confined to a small area is called a(n)

Accepted Answer

A)  local potential.
B)  action potential.
C)  summated potential.
D)  after potential.
E)  resting membrane potential.F) A) and B)
G) A) and C)

Question 11

A person who has seizures might have a deficit of which of the following?

Accepted Answer

A)  GABA
B)  dopamine
C)  glutamate
D)  serotonin
E)  histamineF) All of the above
G) A) and E)

Question 12

A stimulus either causes an action potential or it doesn't.This is called

Accepted Answer

A)  an all-or-none response.
B)  a graded response.
C)  a latent period response.
D)  a relative refractory response.
E)  a local response.F) B) and D)
G) C) and D)

Question 13

Neurotransmitters are released from the

Accepted Answer

A)  epineurium.
B)  synaptic cleft.
C)  presynaptic terminal.
D)  postsynaptic membrane.
E)  calcium channels.F) All of the above
G) A) and B)

Question 14

The speed of an action potential depends upon

Accepted Answer

A)  whether an axon is myelinated or not myelinated.
B)  thickness of the myelin sheath.
C)  the diameter of the axon.
D)  All of the choices are correct.E) B) and C)
F) A) and B)

Question 15

The nervous system

Accepted Answer

A)  monitors internal and external stimuli.
B)  transmits information in the form of action potentials.
C)  interprets or assesses information.
D)  maintains homeostasis.
E)  All of these choices are correct.F) A) and B)
G) A) and C)

Question 16

An IPSP is inhibitory because it

Accepted Answer

A)  changes the threshold of the neuron.
B)  hyperpolarizes the postsynaptic membrane.
C)  prevents Ca2+ entry into the presynaptic terminal.
D)  reduces the amount of neurotransmitter released by the presynaptic terminal.
E)  depolarizes the postsynaptic membrane.F) D) and E)
G) C) and D)

Question 17

Which of the following events will lead to depolarization?

Accepted Answer

A)  an increase in K+ ions in the extracellular fluid
B)  a decrease in K+ ions in the extracellular fluid
C)  an increase in the rate of diffusion of K+ ions from cells
D)  an increase in Na+ ions in the extracellular fluid
E)  None of these events would cause depolarization.F) B) and D)
G) C) and D)

Question 18

The junction of a neuron with another cell is a/an

Accepted Answer

A)  synapse.
B)  ganglion.
C)  receptor.
D)  effector.E) A) and B)
F) None of the above

Question 19

The blood-brain barrier

Accepted Answer

A)  permits passage of foreign substances from the blood to the neurons.
B)  prohibits the transport of amino acids and glucose to the neurons.
C)  prohibits the removal of waste materials from the neurons.
D)  protects neurons from toxic substances in the blood.
E)  does not prevent fluctuations in the composition of the blood from affecting the functions of the brain.F) A) and E)
G) B) and C)

Question 20

Each voltage-gated Na+ ion channel has two voltage sensitive gates: an activation gate and an inactivation gate.Which of the following would occur during depolarization?

Accepted Answer

A)  Activation gates are open; inactivation gates are closed.
B)  Activation gates are closed; inactivation gates are open.
C)  Both activation and inactivation gates are open.
D)  Both activation and inactivation gates are closed.
E)  None of these events occurs during depolarization.F) B) and E)
G) A) and B)

Exam 11: Functional Organization of Nervous Tissue

The strength of a stimulus is communicated through

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A stimulus either causes an action potential or it doesn't.This is called

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The junction of a neuron with another cell is a/an

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A change in resting membrane potential confined to a small area is called a(n)

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In some cells,an afterpotential occurs because

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A neuron with several dendrites and a single axon would be called a ____________ neuron.

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Each voltage-gated Na+ ion channel has two voltage sensitive gates: an activation gate and an inactivation gate.Which of the following would occur during depolarization?

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What inhibitory neurotransmitter is blocked in strychnine poisoning?

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What type of neuroglial cells provide support and nutrition to sensory ganglia in the PNS?

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-The figure illustrates the Action Potential.What does "B" represent?

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The nervous system

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Chemical synapses are characterized by

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Neurotransmitters are released from the

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A person who has seizures might have a deficit of which of the following?

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Match the neuroglial cell with its function. -oligodendrocyte

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An IPSP is inhibitory because it

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Match the following concerning concentration differences across the plasma membrane. -higher inside cell

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Which of the following events will lead to depolarization?

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The blood-brain barrier

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The speed of an action potential depends upon

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