Question 1

Inhibitory postsynaptic potentials (IPSPs)  are associated with

Accepted Answer

A)  depolarization of the cell membrane.
B)  repolarization of the cell membrane.
C)  hyperpolarization of the cell membrane.
D)  no change of the cell membrane potential.
E)  no change of the threshold.F) A) and D)
G) B) and E)

Question 2

A traveling wave of excitation is what we know as

Accepted Answer

A)  a local potential.
B)  a graded potential.
C)  an action potential.
D)  a nerve signal.
E)  a depolarizing signal.F) B) and E)
G) A) and D)

Question 3

When a neuron is stimulated, Na+ gates open and allow Na+ to exit the cell.

Accepted Answer

A) True 
 B)False

Question 4

In order for a peripheral nerve fiber to regenerate it must have

Accepted Answer

A)  all dendrites intact.
B)  at least half the length of the fiber intact.
C)  at least the entire axon and neurilemma intact.
D)  the soma and at least some neurilemma intact.
E)  at least part of the soma intact.F) A) and B)
G) A) and C)

Question 5

Which of these is an example of an EPSP in a typical neuron?

Accepted Answer

A)  a voltage change from 0 mV to +0.35 mV
B)  a voltage change from -70 mV to -69.5 mV
C)  a voltage change from -69.5 mV to -70 mV
D)  a voltage change from +35 mV to 0 mV
E)  a voltage change from -70 mV to -70.5 mVF) A) and E)
G) A) and D)

Question 6

During hyperpolarization (or afterpotential)

Accepted Answer

A)  sodium ions are entering the cells.
B)  sodium ions are leaving the cell.
C)  potassium ions are entering the cell.
D)  potassium ions are leaving the cell.
E)  both sodium and potassium ions are leaving the cell.F) All of the above
G) A) and B)

Question 7

excites skeletal muscle and inhibits cardiac muscle.

Accepted Answer

A)  Norepinephrine
B)  Dopamine
C)  Histamine
D)  Acetylcholine
E)  β-endorphinF) B) and C)
G) A) and E)

Question 8

Parkinson disease is a progressive loss of motor function due to the degeneration of specific neurons. These neurons secrete an inhibitory neurotransmitter that prevents excessive activity in motor centers of the brain.This neurotransmitter is

Accepted Answer

A)  serotonin.
B)  dopamine.
C)  acetylcholine.
D)  GABA (γ-aminobutyric acid) .
E)  glutamate (glutamic acid) .F) A) and E)
G) B) and C)

Question 9

Most local potentials happen at the

Accepted Answer

A)  dendrites.
B)  somas.
C)  axon hillock.
D)  trigger zone.
E)  Schwann cells.F) A) and D)
G) None of the above

Question 10

Norepinephrine is a monoamine.

Accepted Answer

A) True 
 B)False

Question 11

Which of these happens first in an cholinergic synaptic transmission?

Accepted Answer

A)  acetylcholine diffuses across the synaptic cleft
B)  postsynaptic potential is produced
C)  sodium enters the postsynaptic cell
D)  synaptic vesicles release acetylcholine
E)  acetylcholine binds to ligand-regulated gatesF) A) and C)
G) A) and D)

Question 12

Opening of sodium gates typically leads to

Accepted Answer

A)  repolarization of the plasma membrane.
B)  hyperpolarization of the plasma membrane.
C)  depolarization of the plasma membrane.
D)  drifting of plasma membrane voltage toward a more negative value.
E)  plasma membrane voltage returning to the resting membrane potential.F) A) and B)
G) A) and E)

Question 13

An action potential never occurs in dendrites.

Accepted Answer

A) True 
 B)False

Question 14

All of the following are typical characteristics of neurotransmitters except

Accepted Answer

A)  they are synthesized by a presynaptic neuron.
B)  they are released in response to stimulation.
C)  they are released into the bloodstream before reaching the postsynaptic cell.
D)  they bind to specific receptors on the postsynaptic cell.
E)  they alter the physiology of the postsynaptic cell.F) C) and D)
G) B) and C)

Question 15

Memories are formed by neural pathways of modified synapses.

Accepted Answer

A) True 
 B)False

Question 16

neurons are the most common type of neurons.

Accepted Answer

A)  Multipolar
B)  Bipolar
C)  Unipolar
D)  Anaxonic
E)  DendriticF) B) and D)
G) All of the above

Question 17

This image shows a representative neuron.What does "5" represent?

Accepted Answer

A)  synaptic knobs
B)  Schwann cells
C)  trigger zone
D)  node of Ranvier
E)  axon collateralF) A) and D)
G) C) and E)

Question 18

has the greatest influence on the resting membrane potential.

Accepted Answer

A)  Sodium
B)  Chloride
C)  Calcium
D)  Phosphate
E)  PotassiumF) None of the above
G) B) and E)

Question 19

Nerve fiber refers to

Accepted Answer

A)  a nerve cell.
B)  an organelle in nerve cells.
C)  an organ.
D)  an axon.
E)  a bundle of macromolecules in nerve cells.F) A) and C)
G) C) and E)

Question 20

This image shows an action potential.What does "1" represent?

Accepted Answer

A)  a rising local potential
B)  a critical voltage called threshold
C)  hyperpolarization of the membrane
D)  repolarization of the membrane
E)  resting membrane potentialF) A) and E)
G) A) and D)

Exam 12: Nervous Tissue

Opening of sodium gates typically leads to

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When a neuron is stimulated, Na+ gates open and allow Na+ to exit the cell.

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In order for a peripheral nerve fiber to regenerate it must have

Correct AnswerverifiedShow Answer

Which of these is an example of an EPSP in a typical neuron?

Correct AnswerverifiedShow Answer

has the greatest influence on the resting membrane potential.

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Which of these happens first in an cholinergic synaptic transmission?

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Inhibitory postsynaptic potentials (IPSPs) are associated with

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Norepinephrine is a monoamine.

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An action potential never occurs in dendrites.

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This image shows an action potential.What does "1" represent?

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All of the following are typical characteristics of neurotransmitters except

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This image shows a representative neuron.What does "5" represent?

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During hyperpolarization (or afterpotential)

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excites skeletal muscle and inhibits cardiac muscle.

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A traveling wave of excitation is what we know as

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Memories are formed by neural pathways of modified synapses.

Correct AnswerverifiedShow Answer

neurons are the most common type of neurons.

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Most local potentials happen at the

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Nerve fiber refers to

Correct AnswerverifiedShow Answer

Parkinson disease is a progressive loss of motor function due to the degeneration of specific neurons. These neurons secrete an inhibitory neurotransmitter that prevents excessive activity in motor centers of the brain.This neurotransmitter is

Correct AnswerverifiedShow Answer

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