Question 1

Explain the purpose of a neuronal pool.

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Question 2

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

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Question 3

Rabies is caused by a virus that attacks the central nervous system.The virus is normally introduced by an animal bite that breaks the surface of the skin.Since the virus is not motile,how does it travel to the central nervous system?

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Question 4

Receptors on a postsynaptic CNS neuron bind glutamate.Describe how the postsynaptic neuron responds.

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Question 5

Calcium ion entry into the axon terminal is necessary for the release of neurotransmitter into the synaptic cleft in a chemical synapse.

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Calcium ion entry triggers the fusion of synaptic vesicles containing neurotransmitters with the presynaptic membrane, leading to the release of neurotransmitter into the synaptic cleft.

Question 6

The porcupinefish produces a toxin that binds voltage-gated sodium channels.Determine the effect of the toxin on nerve function.

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Question 7

Relate the speed of conduction of an action potential to myelination.

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Question 8

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.

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Question 9

Why is a neuron unable to produce an additional action potential during the absolute refractory period?

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Question 10

Since Jerry's accident,he has had no sensations in his injured leg.Based on the functional classifications of neurons,discuss the type of neuron that has been damaged.Why has he not regained lost nerve function?

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Question 11

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

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Question 12

Summarize the differences between the somatic motor division and the autonomic nervous system.

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Question 13

Explain how leak channels and gated channels differ.

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Question 14

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.

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Question 15

Neurotransmitters can be either excitatory or inhibitory depending upon the receptor present on the postsynaptic neuron.

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This statement is true as neurotransmitters can have different effects, either increasing the likelihood of an action potential firing (excitatory) or decreasing it (inhibitory) based on the receptor they bind to on the postsynaptic neuron.

Question 16

Discuss the neuroglial cells that form the myelin sheaths in the CNS and the PNS and discuss some of their differences.

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Question 17

Discuss the two main factors to influence conduction speed of an action potential.

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Question 18

Discuss the role of calcium ions in the transmission of an action potential at the synapse.

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Question 19

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

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Question 20

Discuss the type of glial cell that becomes activated within a brain region affected by injury.

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Quiz 11: Introduction to the Nervous System Nervous Tissue