Question 1

Action potentials are related to impulses conducted along an axon in that

Accepted Answer

A)  many impulses are required to cause one action potential.
B)  active transport of Na⁺ and K⁺ are required for impulse conduction but not for an action potential.
C)  impulses are stronger responses than are action potentials.
D)  propagation of a series of action potentials along a nerve fiber constitutes an impulse.E) B) and D)
F) A) and B)

Question 2

Nodes of Ranvier lie between neurons.

Accepted Answer

A) True 
 B)False

Question 3

The most rapid conduction of an impulse along an axon occurs on a fiber that is

Accepted Answer

A)  thick and myelinated.
B)  thick and unmyelinated.
C)  thin and myelinated.
D)  thin and unmyelinated.E) B) and D)
F) None of the above

Question 4

During the absolute refractory period, a stimulus of high intensity may trigger a nerve impulse.

Accepted Answer

A) True 
 B)False

Question 5

An impulse conducted along an axon consists of a wave of ________ ________ moving away from a point of stimulation.

Accepted Answer

The answer of An impulse conducted along an axon consists of...

Question 6

Muscles and glands that respond to nervous stimulation are called ________.

Accepted Answer

The answer of Muscles and glands that respond to nervous...

Question 7

Three general functions of the nervous system are

Accepted Answer

A)  sensory, motor, and predictive.
B)  integrative, motor, and sensory.
C)  predictive, manipulative, and integrative.
D)  reflexive, sensory, and predictive.E) A) and B)
F) C) and D)

Question 8

An action potential is triggered if

Accepted Answer

A)  EPSPs overpower IPSPs.
B)  IPSPs overpower EPSPs.
C)  chloride channels open.
D)  the membrane hyperpolarizes.E) None of the above
F) B) and D)

Question 9

A neuron receives a series of stimuli that increases the membrane permeability of Na⁺, but not enough to cause membrane potential to surpass -55mV. This neuron is said to be

Accepted Answer

A)  graded.
B)  amplified.
C)  facilitated.
D)  refractory.E) None of the above
F) A) and D)

Question 10

An immune response that affects the myelin coating on axons throughout the spinal cord and brain, triggering inflammation and leaving scars, is

Accepted Answer

A)  muscular dystrophy.
B)  multiple sclerosis.
C)  Alzheimer disease.
D)  cerebrovascular accident.E) A) and D)
F) All of the above

Question 11

Sheaths of ________ cells often enclose the larger axons outside of the brain and spinal cord.

Accepted Answer

The answer of Sheaths of ________ cells often enclose the...

Question 12

Transmitting an impulse from one neuron to another involves a(n)

Accepted Answer

A)  impulse stimulating presynaptic dendrites to release a neurotransmitter into a synaptic cleft.
B)  impulse stimulating a presynaptic axon to release a neurotransmitter into a synaptic cleft.
C)  neurotransmitter traveling from presynaptic dendrites across a synapse to postsynaptic axons or a cell body.
D)  neurotransmitter traveling from postsynaptic axons across a synapse to presynaptic dendrites or a cell body.E) C) and D)
F) All of the above

Question 13

An excitatory postsynaptic potential lasts for about

Accepted Answer

A)  15 minutes.
B)  15 seconds.
C)  15 milliseconds.
D)  15 microseconds.E) B) and D)
F) All of the above

Question 14

A person is exposed to a drug that prevents vesicles from forming in neurons. Predict the effect this will have on nerve function.

Accepted Answer

A)  Voltage-gated potassium channels will be blocked, slowing depolarization and slowing nerve impulses.
B)  Neurons will be hyper-excitable.
C)  Neurotransmitters won't be released into the synapse via exocytosis.
D)  Action potentials will not be carried through the axon.E) B) and C)
F) None of the above

Question 15

Organize the following list of nervous system elements by their classifications as CNS or PNS elements: oligodendrocytes, thermoreceptors (nerves that sense temperature) , interneurons, satellite cells, brain, motor neurons.

Accepted Answer

A)  CNS thermoreceptors, satellite cells, brain; PNS oligodendrocytes, interneurons, motor neurons
B)  CNS satellite cells, brain, oligodendrocytes; PNS thermoreceptors, motor neurons, interneurons
C)  CNS interneurons, satellite cells, motor neurons; PNS brain, oligodendrocytes, theromoreceptors
D)  CNS brain, oligodendrocytes, interneurons; PNS thermoreceptors, satellite cells, motor neuronsE) A) and D)
F) A) and C)

Question 16

Masses of myelinated nerve fibers appear

Accepted Answer

A)  white.
B)  gray.
C)  brown.
D)  transparent.E) None of the above
F) A) and B)

Question 17

The neurotransmitter most likely produced when a person uses a drug that creates a sense of well-being is

Accepted Answer

A)  glutamic acid.
B)  dopamine.
C)  enkephalin.
D)  substance Q.E) A) and B)
F) A) and C)

Question 18

Which of the following neuroglia are not part of the CNS?

Accepted Answer

A)  Ependymal cells
B)  Astrocytes
C)  Satellite cells
D)  MicrogliaE) A) and B)
F) B) and C)

Question 19

Several interneurons from the spinal cord lead into and interact with the dendrites of a single motor neuron in the leg to sum impulses from several different sensory sources. This phenomenon is called ________.

Accepted Answer

The answer of Several interneurons from the spinal cord lead...

Question 20

Astrocytes structurally support neurons and also provide important signals and nutrients to neurons.

Accepted Answer

A) True 
 B)False

Exam 10: Nervous System I: Basic Structure and Function

A person is exposed to a drug that prevents vesicles from forming in neurons. Predict the effect this will have on nerve function.

Correct AnswerverifiedShow Answer

Three general functions of the nervous system are

Correct AnswerverifiedShow Answer

A neuron receives a series of stimuli that increases the membrane permeability of Na⁺, but not enough to cause membrane potential to surpass -55mV. This neuron is said to be

Correct AnswerverifiedShow Answer

During the absolute refractory period, a stimulus of high intensity may trigger a nerve impulse.

Correct AnswerverifiedShow Answer

Which of the following neuroglia are not part of the CNS?

Correct AnswerverifiedShow Answer

Action potentials are related to impulses conducted along an axon in that

Correct AnswerverifiedShow Answer

An action potential is triggered if

Correct AnswerverifiedShow Answer

An impulse conducted along an axon consists of a wave of ________ ________ moving away from a point of stimulation.

Correct AnswerverifiedShow Answer

Sheaths of ________ cells often enclose the larger axons outside of the brain and spinal cord.

Correct AnswerverifiedShow Answer

The neurotransmitter most likely produced when a person uses a drug that creates a sense of well-being is

Correct AnswerverifiedShow Answer

Muscles and glands that respond to nervous stimulation are called ________.

Correct AnswerverifiedShow Answer

Organize the following list of nervous system elements by their classifications as CNS or PNS elements: oligodendrocytes, thermoreceptors (nerves that sense temperature) , interneurons, satellite cells, brain, motor neurons.

Correct AnswerverifiedShow Answer

Masses of myelinated nerve fibers appear

Correct AnswerverifiedShow Answer

The most rapid conduction of an impulse along an axon occurs on a fiber that is

Correct AnswerverifiedShow Answer

An excitatory postsynaptic potential lasts for about

Correct AnswerverifiedShow Answer

Nodes of Ranvier lie between neurons.

Correct AnswerverifiedShow Answer

Several interneurons from the spinal cord lead into and interact with the dendrites of a single motor neuron in the leg to sum impulses from several different sensory sources. This phenomenon is called ________.

Correct AnswerverifiedShow Answer

Astrocytes structurally support neurons and also provide important signals and nutrients to neurons.

Correct AnswerverifiedShow Answer

Transmitting an impulse from one neuron to another involves a(n)

Correct AnswerverifiedShow Answer

An immune response that affects the myelin coating on axons throughout the spinal cord and brain, triggering inflammation and leaving scars, is

Correct AnswerverifiedShow Answer

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An impulse conducted along an axon consists of a wave of moving away from a point of stimulation.

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