Rio Salado Bio 201 Exam 3 2026
Questions and Answers
Myelination of the nerve fibers in the central nervous system is the job of the
oligodendrocyte.
T/F - Correct answer-True
If bacteria invaded the CNS tissue, microglia would migrate to the area to engulf
and destroy them. T/F - Correct answer-True
Neurons in the CNS are organized into functional groups. T/F - Correct answer-
True
Efferent nerve fibers may be described as motor nerve fibers. T/F - Correct answer-
True
Voltage is always measured between two points and may be called the potential
between these two points. T/F - Correct answer-True
The all-or-none phenomenon as applied to nerve conduction states that the whole
nerve cell must be stimulated for conduction to take place. T/F - Correct answer-
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,False. The all-or-none phenomenon states that the action potential either happens
completely or it doesn't happen at all.
Enkephalins and endorphins are peptides that act like morphine. T/F - Correct
answer-True
Action potentials can be generated by virtually all cells of the body because all
cells possess cell membranes. T/F - Correct answer-False. Only cells with excitable
membranes, such as neurons and muscle cells, can generate action potentials.
Acetylcholine is not a biogenic amine. T/F - Correct answer-True
In myelinated axons the voltage-gated sodium channels are concentrated at the
nodes of Ranvier. T/F - Correct answer-True
During depolarization, the inside of the neuron's membrane becomes less negative.
T or F - Correct answer-True
A graded potential that is the result of a neurotransmitter released into the synapse
between two neurons is called a postsynaptic potential. T or F - Correct answer-
True
Strong stimuli cause the amplitude of action potentials generated to increase. T or
F - Correct answer-False. As stated in the all-or-none phenomenon, an action
potential occurs either completely or it doesn't happen.
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,A synapse formed between the axonal ending of one neuron and the cell body of
another neuron is called an axosomatic synapse. T or F - Correct answer-True
The two major classes of graded potentials are transmitter potentials and receptor
potentials. T or F - Correct answer-False. The two classes of graded potentials are
generator potentials and post-synaptic potentials
A stimulus traveling toward a synapse appears to open calcium channels at the
presynaptic end, which in turn promotes fusion of synaptic vesicles to the axonal
membrane. T or F - Correct answer-True
Sensory neurons have long dendrites, while motor neurons have long axons. T or F
- Correct answer-True
Large-diameter nerve fibers conduct impulses much faster than small-diameter
fibers. T/F - Correct answer-True
Saltatory conduction occurs because of the presence of salt (NaCl) around the
neuron. T or F - Correct answer-False. Saltatory conduction refers to the signal
jumping from node to node along the axon.
The nodes of Ranvier are found only on myelinated, peripheral neural processes. T
or F - Correct answer-True
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, A positive feedback cycle is the main force in the generation of graded potentials at
receptor ends. T or F - Correct answer-False. Positive feedback occurs after
depolarization begins.
Cell bodies of sensory neurons are located in ganglia lying outside the central
nervous system. T or F - Correct answer-True
The oligodendrocytes can myelinate several axons. T or F - Correct answer-True
What component of the neuron conducts impulses toward the nerve cell body? -
Correct answer-Dendrites
Where are neurotransmitters released from? - Correct answer-Axon Terminal
What component of the neuron conducts impulses away from the cell body? -
Correct answer-Axon
What component of the neuron consists of the rough ER? - Correct answer-Nissl
bodies
The interior of the cell becomes less negative due to an influx of sodium ions. -
Correct answer-Depolarization
The specific period during which potassium ions diffuse out of the neuron due to a
change in membrane permeability. - Correct answer-Repolarization
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Questions and Answers
Myelination of the nerve fibers in the central nervous system is the job of the
oligodendrocyte.
T/F - Correct answer-True
If bacteria invaded the CNS tissue, microglia would migrate to the area to engulf
and destroy them. T/F - Correct answer-True
Neurons in the CNS are organized into functional groups. T/F - Correct answer-
True
Efferent nerve fibers may be described as motor nerve fibers. T/F - Correct answer-
True
Voltage is always measured between two points and may be called the potential
between these two points. T/F - Correct answer-True
The all-or-none phenomenon as applied to nerve conduction states that the whole
nerve cell must be stimulated for conduction to take place. T/F - Correct answer-
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,False. The all-or-none phenomenon states that the action potential either happens
completely or it doesn't happen at all.
Enkephalins and endorphins are peptides that act like morphine. T/F - Correct
answer-True
Action potentials can be generated by virtually all cells of the body because all
cells possess cell membranes. T/F - Correct answer-False. Only cells with excitable
membranes, such as neurons and muscle cells, can generate action potentials.
Acetylcholine is not a biogenic amine. T/F - Correct answer-True
In myelinated axons the voltage-gated sodium channels are concentrated at the
nodes of Ranvier. T/F - Correct answer-True
During depolarization, the inside of the neuron's membrane becomes less negative.
T or F - Correct answer-True
A graded potential that is the result of a neurotransmitter released into the synapse
between two neurons is called a postsynaptic potential. T or F - Correct answer-
True
Strong stimuli cause the amplitude of action potentials generated to increase. T or
F - Correct answer-False. As stated in the all-or-none phenomenon, an action
potential occurs either completely or it doesn't happen.
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
,A synapse formed between the axonal ending of one neuron and the cell body of
another neuron is called an axosomatic synapse. T or F - Correct answer-True
The two major classes of graded potentials are transmitter potentials and receptor
potentials. T or F - Correct answer-False. The two classes of graded potentials are
generator potentials and post-synaptic potentials
A stimulus traveling toward a synapse appears to open calcium channels at the
presynaptic end, which in turn promotes fusion of synaptic vesicles to the axonal
membrane. T or F - Correct answer-True
Sensory neurons have long dendrites, while motor neurons have long axons. T or F
- Correct answer-True
Large-diameter nerve fibers conduct impulses much faster than small-diameter
fibers. T/F - Correct answer-True
Saltatory conduction occurs because of the presence of salt (NaCl) around the
neuron. T or F - Correct answer-False. Saltatory conduction refers to the signal
jumping from node to node along the axon.
The nodes of Ranvier are found only on myelinated, peripheral neural processes. T
or F - Correct answer-True
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
, A positive feedback cycle is the main force in the generation of graded potentials at
receptor ends. T or F - Correct answer-False. Positive feedback occurs after
depolarization begins.
Cell bodies of sensory neurons are located in ganglia lying outside the central
nervous system. T or F - Correct answer-True
The oligodendrocytes can myelinate several axons. T or F - Correct answer-True
What component of the neuron conducts impulses toward the nerve cell body? -
Correct answer-Dendrites
Where are neurotransmitters released from? - Correct answer-Axon Terminal
What component of the neuron conducts impulses away from the cell body? -
Correct answer-Axon
What component of the neuron consists of the rough ER? - Correct answer-Nissl
bodies
The interior of the cell becomes less negative due to an influx of sodium ions. -
Correct answer-Depolarization
The specific period during which potassium ions diffuse out of the neuron due to a
change in membrane permeability. - Correct answer-Repolarization
©COPYRIGHT 2025, ALL RIGHTS RESERVED 4
