Question 1

Which of the following best describes a bipolar neuron?

Accepted Answer

A)  one axon that splits into two processes
B)  one axon and one dendrite
C)  multiple axons and one dendrite
D)  one axon and multiple,highly branched dendritesE) B) and C)
F) B) and D)

Question 2

Within the PNS,a neuron will regenerate only if:

Accepted Answer

A)  the neuron was myelinated.
B)  the surrounding neuroglia regenerate first.
C)  scar tissue is removed by phagocytosis.
D)  the cell body remains intact.E) C) and D)
F) A) and D)

Question 3

What type of postsynaptic potential would be more likely to promote an action potential-an IPSP or EPSP? Explain.

Accepted Answer

A small,local depolarization called an E...

Question 4

A postsynaptic neuron is bombarded by synaptic inputs from several hundred presynaptic neurons.However,this neuron does not appear to transmit an impulse.Propose an explanation of why this could occur.

Accepted Answer

The input from each presynaptic neuron m...

Question 5

Kelly takes an antihistamine for allergies.Explain why sleepiness is a side effect of this medicine.

Accepted Answer

Antihistamines are drugs that block hist...

Question 6

Which area on the graph shows when the neuron is in the relative refractory period?

Accepted Answer

A)  1
B)  2
C)  3
D)  4E) C) and D)
F) B) and C)

Question 7

After acetylcholinesterase (AChE) acts,the presynaptic neuron:

Accepted Answer

A)  reabsorbs synaptic vesicles.
B)  reabsorbs the acetate.
C)  reabsorbs the choline.
D)  reabsorbs acetylcholine.E) A) and D)
F) A) and C)

Question 8

Discuss the two main factors involved in the generation of a neuron's resting membrane potential.

Accepted Answer

The main factor is the ease at which pot...

Question 9

Which of the following is an effect of myelination?

Accepted Answer

A)  Myelination increases the rate at which phagocytosis occurs in the brain.
B)  Myelination increases the rate of mitosis in damaged neurons.
C)  Myelination increases the volume of cerebrospinal fluid in circulation.
D)  Myelination increases the speed of conduction of action potentials.E) A) and B)
F) All of the above

Question 10

Multiple sclerosis (MS)is a disease in which the myelin sheaths are destroyed in the brain and spinal cord.With what process does this interfere and what would be the consequences?

Accepted Answer

Myelin sheaths allow the action potentia...

Question 11

Because of their ability to rapidly divide during brain injury,which type of neuroglial cell would be more likely to form a brain tumor?

Accepted Answer

A)  Schwann cell
B)  oligodendrocyte
C)  astrocyte
D)  ependymal cellE) B) and D)
F) None of the above

Question 12

The majority of synapses in the nervous system are:

Accepted Answer

A)  chemical.
B)  electrical.
C)  mechanical.
D)  voltage.E) B) and C)
F) A) and D)

Question 13

What part of the neuron is a process that can generate and conduct action potentials?

Accepted Answer

A)  dendrite
B)  axon
C)  cell body
D)  neurofibrilE) A) and C)
F) B) and C)

Question 14

The two structural divisions of the nervous system are the:

Accepted Answer

A)  central nervous system and peripheral nervous system.
B)  visceral motor division and somatic motor division.
C)  somatic sensory division and visceral sensory system.
D)  sensory division and motor division.E) None of the above
F) B) and C)

Question 15

What membrane potential must generally be met in order to achieve threshold?

Accepted Answer

A)  - 30 mV
B)  - 55 mV
C)  - 70 mV
D)  - 85 mVE) None of the above
F) C) and D)

Question 16

During the absolute refractory period,production of an additional action potential is not possible no matter how strong the stimulus.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following must happen first in the order events at a chemical synapse?

Accepted Answer

A)  Calcium ions cause synaptic vesicles to release neurotransmitters into the synaptic cleft.
B)  Calcium ion channels in the axon terminal open.
C)  Neurotransmitter binds to receptors on the postsynaptic neuron.
D)  Ion channels respond to the neurotransmitter and lead to a local potential,or possibly an action potential.E) B) and C)
F) None of the above

Question 18

Acetylcholine (ACh)may excite postsynaptic neurons in the CNS; however,it may inhibit some postsynaptic neurons in the PNS.Explain how acetylcholine can be both excitatory and inhibitory.

Accepted Answer

Acetylcholine can have an excitatory eff...

Question 19

Saltatory conduction is slow due to the presence of insulating myelin around an axon.

Accepted Answer

A) True 
 B)False

Question 20

What best describes a converging circuit?

Accepted Answer

A)  One axon of an input neuron branches to make contact with multiple postsynaptic neurons.
B)  An increasing number of neurons are excited down the pathway of the circuit.
C)  Axon terminals from multiple input neurons join onto a single postsynaptic neuron.
D)  One neuron communicates with multiple parts of the brain.E) B) and C)
F) None of the above

Exam 11: Introduction to the Nervous System Nervous Tissue

Saltatory conduction is slow due to the presence of insulating myelin around an axon.

Correct AnswerverifiedShow Answer

Which of the following must happen first in the order events at a chemical synapse?

Correct AnswerverifiedShow Answer

Kelly takes an antihistamine for allergies.Explain why sleepiness is a side effect of this medicine.

Correct AnswerverifiedAntihistamines are drugs that block hist...View AnswerShow Answer

During the absolute refractory period,production of an additional action potential is not possible no matter how strong the stimulus.

Correct AnswerverifiedShow Answer

Which area on the graph shows when the neuron is in the relative refractory period?

Correct AnswerverifiedShow Answer

A postsynaptic neuron is bombarded by synaptic inputs from several hundred presynaptic neurons.However,this neuron does not appear to transmit an impulse.Propose an explanation of why this could occur.

Correct AnswerverifiedThe input from each presynaptic neuron m...View AnswerShow Answer

Discuss the two main factors involved in the generation of a neuron's resting membrane potential.

Correct AnswerverifiedThe main factor is the ease at which pot...View AnswerShow Answer

What part of the neuron is a process that can generate and conduct action potentials?

Correct AnswerverifiedShow Answer

Within the PNS,a neuron will regenerate only if:

Correct AnswerverifiedShow Answer

What membrane potential must generally be met in order to achieve threshold?

Correct AnswerverifiedShow Answer

Which of the following is an effect of myelination?

Correct AnswerverifiedShow Answer

After acetylcholinesterase (AChE) acts,the presynaptic neuron:

Correct AnswerverifiedShow Answer

Multiple sclerosis (MS)is a disease in which the myelin sheaths are destroyed in the brain and spinal cord.With what process does this interfere and what would be the consequences?

Correct AnswerverifiedMyelin sheaths allow the action potentia...View AnswerShow Answer

What best describes a converging circuit?

Correct AnswerverifiedShow Answer

Which of the following best describes a bipolar neuron?

Correct AnswerverifiedShow Answer

The two structural divisions of the nervous system are the:

Correct AnswerverifiedShow Answer

The majority of synapses in the nervous system are:

Correct AnswerverifiedShow Answer

Because of their ability to rapidly divide during brain injury,which type of neuroglial cell would be more likely to form a brain tumor?

Correct AnswerverifiedShow Answer

Acetylcholine (ACh)may excite postsynaptic neurons in the CNS; however,it may inhibit some postsynaptic neurons in the PNS.Explain how acetylcholine can be both excitatory and inhibitory.

Correct AnswerverifiedAcetylcholine can have an excitatory eff...View AnswerShow Answer

What type of postsynaptic potential would be more likely to promote an action potential-an IPSP or EPSP? Explain.

Correct AnswerverifiedA small,local depolarization called an E...View AnswerShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Antihistamines are drugs that block hist...
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Correct Answer
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Which area on the graph shows when the neuron is in the relative refractory period? $Which area on the graph shows when the neuron is in the relative refractory period? A) 1 B) 2 C) 3 D) 4$

Correct Answer
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Correct Answer
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The input from each presynaptic neuron m...
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Correct Answer
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The main factor is the ease at which pot...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
verified
Myelin sheaths allow the action potentia...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Acetylcholine can have an excitatory eff...
View Answer

Correct Answer
verified
A small,local depolarization called an E...
View Answer