Chapter 12-14 Mastering Practice Questions Flashcards
The \_\_\_\_\_\_\_\_ division of the peripheral nervous system brings sensory information to the central nervous system. A. Autonomic B. Peripheral C. Parasympathetic D. Somatic E. Afferent
E. Afferent
The \_\_\_\_\_\_\_\_ division of the nervous system carries motor commands to muscles and glands. A. Afferent B. Spinal C. Peripheral D. Efferent E. Autonomic
D. Efferent
Axons terminate in a series of fine extensions known as... A. Telodendria B. Dendrites C. Collaterals D. Terminals E. Synapses
A. Telodendria
The site of intercellular communication between a neuron and another cell is the... A. Synapse B. Collateral C. Axolemma D. Hillock E. Telodendria
A. Synapse
How does blocking retrograde axoplasmic transport in an axon affect the activity of a neuron?
A. The soma becomes unable to respond to changes in the distal end of the axon.
B. The neuron becomes unable to depolarize when stimulated.
C. The neuron becomes unable to produce neurotransmitters.
D. The soma becomes unable to export products to the synaptic terminals.
E. The neuron becomes unable to produce action potentials.
A. The soma becomes unable to respond to changes in the distal end of the axon
Most neurons lack \_\_\_\_\_\_\_\_ and so are permanently blocked from undergoing cell division. A. A nucleus B. Endoplasmic reticula C. Ribosomes D. Centrioles E. Cytoplasm
D. Centrioles
In order to communicate with multiple cells at the same time, an axon may branch along its length, producing side branches called \_\_\_\_\_\_\_\_\_\_. A. Initial segment B. Axon terminal C. Collaterals D. Telodendria
C. Collaterals
Deteriorating changes in the distal segment of an axon as a result of a break between it and the soma is called \_\_\_\_\_\_\_\_ degeneration. A. Conduction B. Wallerian C. Neural D. Peripheral E. Central
B. Wallerian
The largest and most numerous of the glial cells in the central nervous system are the... A. Astrocytes B. Microglia C. Satellite cells D. Oligodendrocytes E. Ependymal cells
A. Astrocytes
\_\_\_\_\_\_\_\_ account for roughly half of the volume of the nervous system. A. Dendrites B. Axons C. Synapses D. Neuroglia E. Efferent fibers
D. Neuroglia
The myelin sheath that covers many CNS axons is formed by... A. Satellite cells B. Astrocytes C. Ependymal cells D. Microglia E. Oligodendrocytes
E. Oligodendrocytes
Small, wandering cells that engulf cell debris and pathogens in the CNS are called... A. Oligodendrocytes B. Astrocytes C. Microglia D. Satellite cells E. Ependymal cells
C. Microglia
Damage to ependymal cells would most likely affect the…
A. Formation of cerebrospinal fluid
B. Formation of myelin sheaths
C. Repair of axons
D. Transport of neurotransmitters within axons
E. Formation of ganglia
A. Formation of cerebrospinal fluid
In the peripheral nervous system, Schwann cells participate in the repair of damaged nerves by…
A. Producing new axons
B. Forming a cellular cord that directs axonal regrowth
C. Clearing away cellular debris
D. Regenerating cell bodies for the neurons
E. Producing more satellite cells that fuse to form new axons
B. Forming a cellular cord that directs axonal regrowth
The tiny gaps between adjacent Schwann cells are called... A. Terminals B. Axolemma C. Neurillema D. Vesicles E. Nodes of Ranvier
E. Nodes of Ranvier
When a person has a stroke, blood leaks into the brain tissue. Which type of neuroglia cells would make structural repairs to the damage? A. Oligodendrocytes B. Astrocytes C. Ependymal cells D. Satellite cells
B. Astrocytes
Opening of sodium channels in the axon membrane causes…
A. Hyperpolarization
B. Repolarization
C. Increased negative charge inside the membrane
D. Inhibition
E. Depolarization
E. Depolarization
A shift of the resting transmembrane potential toward 0 mV is called... A. Hyperpolarization B. Repolarization C. Depolarization D. Potential difference E. Polarization
C. Depolarization
Which type of ion channel is always open? A. Leak B. Mechanically gated C. Voltage gated D. Chemically gated
A. Leak
Puffer fish poison blocks voltage-gated sodium channels like a cork. What effect would this neurotoxin have on the function of neurons?
A. The axon would be unable to generate action potentials
B. Action potentials would lack a repolarization phase
C. Neurons would depolarize more rapidly
D. The absolute refractory period would be shorter than normal
E. None, because the chemically gated sodium channels would still function
A. The axon would be unable to generate action potentials
Rapid impulse conduction from "node" to "node" is called... A. Synaptic transmission B. Continuous propagation C. Spatial propagation D. Divergent propagation E. Saltatory propagation
E. Saltatory propagation
The minimum stimulus required to trigger an action potential is known as the... A. Incentive B. Threshold C. Potential D. Summation E. All-or-none response
B. Threshold
The presence of \_\_\_\_\_\_\_\_ dramatically increases the speed at which an action potential moves along an axon. A. Plasma protein B. Myelin C. A capsule D. Glial cells E. Neurilemma
B. Myelin
When you take a pain reliever, which of the following best describes, in general terms, how this affects the threshold of neurons?
A. Taking a pain reliever does not affect the threshold of neurons
B. Taking a pain reliever affects the all-or-none principle of neurons. So, neurons reaching threshold send an action potential at 50%
C. Taking a pain reliever decreases the threshold
D. Taking a pain reliever increases the threshold
D. Taking a pain reliever increases the threshold
A neuron that receives neurotransmitter from another neuron is called... A. The motor neuron B. The postsynaptic neuron C. The presynaptic neuron D. A satellite cell E. An oligodendrocyte
B. The postsynaptic neuron
At a(n) \_\_\_\_\_\_\_\_ synapse, a neurotransmitter is released to stimulate the postsynaptic membrane. A. Chemical B. Electrical C. Gap D. Cell E. Osmotic
A. Chemical
Which ion triggers synaptic vesicles to discharge neurotransmitter into the synaptic cleft? A. Calcium B. Potassium C. Sodium D. Magnesium
A. Calcium
Which of the following is the most important excitatory neurotransmitter in the brain that is important in learning and memory? A. Gamma aminobutyric acid B. Glutamate C. Glycine D. Noradrenaline E. Serotonin
B. Glutamate
Which neurotransmitter has widespread effects on a person's attention and emotional state? A. Dopamine B. Norepinephrine C. Serotonin D. GABA E. Endorphins
C. Serotonin
The site in the neuron where EPSPs and IPSPs are integrated is the... A. Chemical synapse B. Synaptic terminal C. Axon hillock D. Dendritic membrane E. Electrical synapse
C. Axon hillock
EPSPs (excitatory postsynaptic potentials) occur when…
A. More potassium ions than usual leak out of a cell
B. Hyperpolarizations occur
C. Extra sodium ions enter a cell
D. More calcium ions than usual leak out of a cell
E. Chloride ions enter a cell
C. Extra sodium ions enter a cell
IPSPs (inhibitory postsynaptic potentials)…
A. Block the efflux of potassium ions
B. Block the efflux of calcium ions
C. Are local depolarizations
D. Increase membrane permeability to sodium ions
E. Are local hyperpolarizations
E. Are local hyperpolarizations
Summation that results from the cumulative effect of multiple synapses at multiple places on the neuron is designated... A. Inhibition of the impulse B. Spatial summation C. Temporal summation D. Impulse transmission E. Hyperpolarization
B. Spatial summation
Which of these neurotransmitters does NOT bind to a plasma membrane receptor? A. Norepinephrine B. Nitric oxide C. Serotonin D. GABA
B. Nitric oxide
The simplest level of information processing takes place at the \_\_\_\_\_\_\_\_\_\_. A. Axon terminals B. Dendrites C. Soma D. Axon hillock
D. Axon hillock
Arrange the spinal meninges from innermost layer to outermost layer…
A. Dura mater, pia mater, arachnoid mater
B. Pia mater, dura mater, arachnoid mater
C. Pia mater, arachnoid mater, dura mater
D. Dura mater, arachnoid mater, pia mater
E. Arachnoid mater, pia mater, dura mater
C. Pia mater, arachnoid mater, dura mater
These structures extending from the pia mater through to the dura mater support the spinal cord by preventing lateral movement... A. Denticulate ligaments B. Coccygeal ligament C. Cauda equina D. Spinal ligaments E. Rami communicantes
A. Denticulate ligaments
Spinal nerves are... A. Both sensory and motor B. Interneuronal C. Purely motor D. Purely sensory E. Involuntary
A. Both sensory and motor
If the posterior root of a spinal nerve is severed,
A. The brain would not be able to communicate with that level of the spinal cord
B. Output to skeletal muscles would be blocked
C. Output to visceral organs would be blocked
D. Efferent fibers would be blocked
E. Sensory input would be blocked
E. Sensory input would be blocked
A posterior and anterior root of each spinal segment unite to form a... A. Spinal ganglion B. Spinal nerve C. Cervical enlargement D. Denticulate ligament E. Lumbar enlargement
B. Spinal nerve