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Exam 11: Fundamentals of the Nervous System and Nervous Tissue

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Question 31

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Schwann cells are functionally similar to ________.

A) ependymal cells
B) microglia
C) oligodendrocytes
D) astrocytes

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Question 32

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The overlapping functions of the nervous system are sensory input, integration, and motor output.

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Question 33

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Immediately after an action potential has peaked, which cellular gates open?

The synapse more common in embryonic nervous tissue than in adults is the ________.

Collections of nerve cell bodies outside the central nervous system are called ________.

Neuroglia that control the chemical environment around neurons by buffering potassium and recapturing neurotransmitters are ________.

Figure 11.1 Using Figure 11.1, match the following: -Which neuron is never myelinated?

In myelinated axons the voltage-regulated sodium channels are concentrated at the nodes of Ranvier.

Figure 11.2 Using Figure 11.2, match the following: -Synaptic cleft.

Which of the following will occur when an excitatory postsynaptic potential (EPSP) is being generated on the dendritic membrane?

Match the following: A) Spatial summation B) Threshold stimulus C) Subthreshold stimulus D) Temporal summation -An insufficient stimulus.

How can a single axon respond to several different kinds of events?

Match the following: A) Absolute refractory period B) Repolarization C) Action potential D) Depolarization E) Relative refractory period -The neuron cannot respond to a second stimulus, no matter how strong.

Which of the following neurotransmitters inhibits pain and is mimicked by morphine, heroin, and methadone?

If a motor neuron in the body were stimulated by an electrode placed about midpoint along the length of the axon ________.

What is the role of microglial cells and why are they so important in the CNS?

What is the difference between a direct acting neurotransmitter and an indirect acting neurotransmitter?

Which of the following describes the excitatory postsynaptic potential?

Match the following: A) Spatial summation B) Threshold stimulus C) Subthreshold stimulus D) Temporal summation -Numerous nerve impulses arriving at a synapse at closely timed intervals exert a cumulative effect.

Why does a hyperpolarization phase generally follow a repolarization phase in an action potential?