Rio Salado Bio 201 Exam 3 (2025) UPDATE
Myelination of the nerve fibers in the central nervous system is the job of the oligodendrocyte.
T/F - Answer: True
If bacteria invaded the CNS tissue, microglia would migrate to the area to engulf and destroy
them. T/F - Answer: True
Neurons in the CNS are organized into functional groups. T/F - Answer: True
Efferent nerve fibers may be described as motor nerve fibers. T/F - Answer: True
Voltage is always measured between two points and may be called the potential between these
two points. T/F - 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 - Answer: 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 - Answer: True
Action potentials can be generated by virtually all cells of the body because all cells possess cell
membranes. T/F - 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 - Answer: True
In myelinated axons the voltage-gated sodium channels are concentrated at the nodes of
Ranvier. T/F - Answer: True
,Rio Salado Bio 201 Exam 3 (2025) UPDATE
During depolarization, the inside of the neuron's membrane becomes less negative. T or F -
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 - Answer: True
Strong stimuli cause the amplitude of action potentials generated to increase. T or F - Answer:
False. As stated in the all-or-none phenomenon, an action potential occurs either completely or
it doesn't happen.
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 - Answer: True
The two major classes of graded potentials are transmitter potentials and receptor potentials. T
or F - 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 - Answer:
True
Sensory neurons have long dendrites, while motor neurons have long axons. T or F - Answer:
True
Large-diameter nerve fibers conduct impulses much faster than small-diameter fibers. T/F -
Answer: True
,Rio Salado Bio 201 Exam 3 (2025) UPDATE
Saltatory conduction occurs because of the presence of salt (NaCl) around the neuron. T or F -
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 -
Answer: True
A positive feedback cycle is the main force in the generation of graded potentials at receptor
ends. T or F - 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 - Answer: True
The oligodendrocytes can myelinate several axons. T or F - Answer: True
What component of the neuron conducts impulses toward the nerve cell body? - Answer:
Dendrites
Where are neurotransmitters released from? - Answer: Axon Terminal
What component of the neuron conducts impulses away from the cell body? - Answer: Axon
What component of the neuron consists of the rough ER? - Answer: Nissl bodies
The interior of the cell becomes less negative due to an influx of sodium ions. - Answer:
Depolarization
, Rio Salado Bio 201 Exam 3 (2025) UPDATE
The specific period during which potassium ions diffuse out of the neuron due to a change in
membrane permeability. - Answer: Repolarization
Period during which the neuron cannot respond to a second stimulus, no matter how strong. -
Answer: Absolute refractory period
An exceptionally strong stimulus can trigger a response. - Answer: Relative refractory period
Called a nerve impulse when transmitted - Answer: action potential
Circuits category: Smells are processed by serial pathways. T or F - Answer: False
Neurophysiology category: Some ions are prevented from moving down their concentration
gradients by ATP-driven pumps. T or F - Answer: True
Potentials category: graded potentials are short-lived. T or F - Answer: True
Circuits category: Which neuronal circuit concentrates or directs a large number of incoming
impulses to a rather small number of neurons?
A. Converging
B. Diverging - Answer: Converging
CNS, PNS, ANS category: Innervation of skeletal muscle is a function of the autonomic nervous
system. T or F - Answer: False
Neurophysiology category: The sodium-potassium pump pumps three sodium ions outside the
cell and two potassium ions inside. T or F - Answer: True
Myelination of the nerve fibers in the central nervous system is the job of the oligodendrocyte.
T/F - Answer: True
If bacteria invaded the CNS tissue, microglia would migrate to the area to engulf and destroy
them. T/F - Answer: True
Neurons in the CNS are organized into functional groups. T/F - Answer: True
Efferent nerve fibers may be described as motor nerve fibers. T/F - Answer: True
Voltage is always measured between two points and may be called the potential between these
two points. T/F - 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 - Answer: 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 - Answer: True
Action potentials can be generated by virtually all cells of the body because all cells possess cell
membranes. T/F - 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 - Answer: True
In myelinated axons the voltage-gated sodium channels are concentrated at the nodes of
Ranvier. T/F - Answer: True
,Rio Salado Bio 201 Exam 3 (2025) UPDATE
During depolarization, the inside of the neuron's membrane becomes less negative. T or F -
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 - Answer: True
Strong stimuli cause the amplitude of action potentials generated to increase. T or F - Answer:
False. As stated in the all-or-none phenomenon, an action potential occurs either completely or
it doesn't happen.
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 - Answer: True
The two major classes of graded potentials are transmitter potentials and receptor potentials. T
or F - 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 - Answer:
True
Sensory neurons have long dendrites, while motor neurons have long axons. T or F - Answer:
True
Large-diameter nerve fibers conduct impulses much faster than small-diameter fibers. T/F -
Answer: True
,Rio Salado Bio 201 Exam 3 (2025) UPDATE
Saltatory conduction occurs because of the presence of salt (NaCl) around the neuron. T or F -
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 -
Answer: True
A positive feedback cycle is the main force in the generation of graded potentials at receptor
ends. T or F - 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 - Answer: True
The oligodendrocytes can myelinate several axons. T or F - Answer: True
What component of the neuron conducts impulses toward the nerve cell body? - Answer:
Dendrites
Where are neurotransmitters released from? - Answer: Axon Terminal
What component of the neuron conducts impulses away from the cell body? - Answer: Axon
What component of the neuron consists of the rough ER? - Answer: Nissl bodies
The interior of the cell becomes less negative due to an influx of sodium ions. - Answer:
Depolarization
, Rio Salado Bio 201 Exam 3 (2025) UPDATE
The specific period during which potassium ions diffuse out of the neuron due to a change in
membrane permeability. - Answer: Repolarization
Period during which the neuron cannot respond to a second stimulus, no matter how strong. -
Answer: Absolute refractory period
An exceptionally strong stimulus can trigger a response. - Answer: Relative refractory period
Called a nerve impulse when transmitted - Answer: action potential
Circuits category: Smells are processed by serial pathways. T or F - Answer: False
Neurophysiology category: Some ions are prevented from moving down their concentration
gradients by ATP-driven pumps. T or F - Answer: True
Potentials category: graded potentials are short-lived. T or F - Answer: True
Circuits category: Which neuronal circuit concentrates or directs a large number of incoming
impulses to a rather small number of neurons?
A. Converging
B. Diverging - Answer: Converging
CNS, PNS, ANS category: Innervation of skeletal muscle is a function of the autonomic nervous
system. T or F - Answer: False
Neurophysiology category: The sodium-potassium pump pumps three sodium ions outside the
cell and two potassium ions inside. T or F - Answer: True
