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Simple Multiple Choice
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1
Structurally, the nervous system consists of which two subdivisions?
A)somatic and visceral
B)somatic and autonomic
C)central and peripheral
D)sensory and motor
2
Clusters of neuron cell bodies located outside the CNS are called
A)centers
B)ganglia
C)nuclei
D)nerves
3
Which functional division of the nervous system includes the SNS and ANS?
A)sensory
B)motor
C)central
D)peripheral
4
In the PNS, components of the afferent division include
A)interneurons
B)motor neurons
C)sensory neurons
D)all of the above
5
Which effectors are innervated by visceral motor neurons?
A)cardiac muscle, smooth muscle, and glands
B)somatic effectors other than skeletal muscle
C)skeletal muscle, skin, and joints
D)interneurons of the CNS
6
The two distinct cell types that compose all nervous tissue are
A)microglia and astrocytes
B)neurons and glial cells
C)satellite cells and neurolemmocytes
D)oligodendrocytes and ependymal cells
7
In neurons, the abundant free and bound ribosomes are collectively called the
A)neurofibrils and neurotubules
B)perikaryon
C)chromatophilic substance
D)axon hillock
8
The slightly expanded tips of telodendria are called
A)synaptic knobs
B)synapses
C)axon terminals
D)axon collaterals
9
The cytoplasm in a neuron cell body (or sometimes the entire cell body) is called the
A)neurilemma
B)perineurium
C)epineurium
D)perikaryon
10
Structural categories of neurons include which of the following?
A)sensory, motor, and interneurons
B)unipolar, bipolar, and multipolar
C)afferent, association, and efferent
D)all of the above
11
Neurons with numerous dendrites and a single axon are structurally classified as
A)association neurons
B)multipolar neurons
C)motor neurons
D)pseudounipolar neurons
12
Efferent neurons transmit nerve impulses
A)between interneurons in the CNS
B)from sensory receptors to the CNS
C)from the CNS to muscles or glands
D)from the spinal cord to the brain
13
Collectively, glial cells do all of the following except
A)physically protect and help nourish neurons
B)guide young migrating neurons during development
C)provide a supporting framework for all nervous tissue
D)synthesize neurotransmitters and conduct nerve impulses
14
The word root glia, as in "glial cells," most nearly means
A)star
B)small
C)glue
D)to clasp
15
Which pair names only neuroglia of the central nervous system?
A)astrocytes and interneurons
B)ependymal cells and astrocytes
C)microglia and neurolemmocytes
D)oligodendrocytes and satellite cells
16
Which description refers to oligodendrocytes?
A)small cells with slender branches from the cell body
B)large, star-shaped cells with numerous cell processes
C)large, bulbous cells with slender cytoplasmic extensions
D)flattened cells wrapped around axons to form myelin
17
The largest and most abundant of the CNS glial cells, ____________ help form the blood-brain barrier.
A)astrocytes
B)oligodendrocytes
C)neurolemmocytes
D)ependymal cells
18
Which types of glial cells are found in the peripheral nervous system?
A)oligodendrocytes and astrocytes
B)microglia and ependymal cells
C)neurolemmocytes and satellite cells
D)all of the above
19
Which term describes the collection of lipids and proteins that may form a protective coating around an axon?
A)neurofibril
B)myelin
C)node of Ranvier
D)endoneurium
20
Myelination affects nerve impulse conduction in which of the following ways?
A)allows saltatory conduction from one neurofibril node to the next
B)permits nerve impulses to travel continuously along the entire axon
C)slows the nerve impulse by exposing only limited parts of the axon
D)all of the above
21
Axon regeneration in the PNS involves ____________ in a process known as Wallerian ____________.
A)satellite cells; stimulation
B)ependymal cells; neogenesis
C)oligodendrocytes; replacement
D)neurolemmocytes; degeneration
22
Nerves are bundles of parallel axons in the PNS that have three successive connective tissue wrappings, called the
A)endoneurium, perineurium, and epineurium
B)endomysium, perimysium, and epimysium
C)deep fascia, subserous fascia, and superficial fascia
D)pia mater, arachnoid layer, and dura mater
23
The point at which two excitable cells contact to exchange information is called a
A)flash point
B)gap junction
C)neurofibril node
D)synapse
24
The synaptic knob of a neuron may contact another neuron anywhere except on its
A)dendrites
B)cell body
C)myelin sheath
D)synaptic knob
25
At a chemical synapse, the presynaptic membrane releases a signaling molecule called a
A)synaptic enzyme
B)nerve impulse
C)hormone
D)neurotransmitter
26
Which one of the following is not a step in the conduction of a nerve impulse across a chemical synapse?
A)the nerve impulse causes an influx of Ca2+ ions into the synaptic knob
B)calcium ions entering the synaptic cleft cause the endocytosis of synaptic vesicles
C)neurotransmitter molecules diffuse across the synaptic cleft to the postsynaptic cell
D)a voltage change in the postsynaptic cell triggers a nerve impulse to begin there
27
The rate of conduction of a nerve impulse is influenced by the
A)length of the axon and number of axon collaterals
B)strength and frequency of the stimulus that initiated it
C)diameter of the axon and presence or absence of a myelin sheath
D)number of telodendria and presence or absence of axon collaterals
28
Which description doesnot accurately characterize neuronal pools?
A)consist of complex patterns of interconnected neurons
B)have limited number of input sources and output destinations
C)may be localized or distributed in several different regions of the CNS
D)have numerous types of circuits defined by structural features
29
All of the following are types of neuronal circuits except
A)converging
B)diverging
C)proliferating
D)reverberating
30
In the embryo, the neural plate (which gives rise to most nervous tissue structures) develops from
A)ectoderm
B)mesoderm
C)endoderm
D)all of the above







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