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Rio Salado Bio 201 Exam 3, 346 Questions and Correct Answers, 100% Correct. Latest 2024/5.
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Rio Salado Bio 201 Exam 3, 346 Questions and Correct Answers, 100% Correct. Latest 2024/5. Myelination of the nerve fibers in the central nervous system is the job of the oligodendrocyte. T/F True If bacteria invaded the CNS tissue, microglia would migrate to the area to engulf and destroy th...

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Rio Salado Bio 201 Exam 3, 346
Questions and Correct Answers, 100%
Correct. Latest 2024/5.
Myelination of the nerve fibers in the central nervous system is the job of the oligodendrocyte.
T/F

True

If bacteria invaded the CNS tissue, microglia would migrate to the area to engulf and destroy them. T/F

True

Neurons in the CNS are organized into functional groups. T/F

True

Efferent nerve fibers may be described as motor nerve fibers. T/F

True

Voltage is always measured between two points and may be called the potential between these two
points. T/F

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

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

True

Action potentials can be generated by virtually all cells of the body because all cells possess cell
membranes. T/F

False. Only cells with excitable membranes, such as neurons and muscle cells, can generate action
potentials.

Acetylcholine is not a biogenic amine. T/F

True

In myelinated axons the voltage-gated sodium channels are concentrated at the nodes of Ranvier. T/F

True

,During depolarization, the inside of the neuron's membrane becomes less negative. T or F

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

True

Strong stimuli cause the amplitude of action potentials generated to increase. T or F

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

True

The two major classes of graded potentials are transmitter potentials and receptor potentials. T or F

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

True

Sensory neurons have long dendrites, while motor neurons have long axons. T or F

True

Large-diameter nerve fibers conduct impulses much faster than small-diameter fibers. T/F

True

Saltatory conduction occurs because of the presence of salt (NaCl) around the neuron. T or F

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

True

A positive feedback cycle is the main force in the generation of graded potentials at receptor ends. T or F

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

True

The oligodendrocytes can myelinate several axons. T or F

True

,What component of the neuron conducts impulses toward the nerve cell body?

Dendrites

Where are neurotransmitters released from?

Axon Terminal

What component of the neuron conducts impulses away from the cell body?

Axon

What component of the neuron consists of the rough ER?

Nissl bodies

The interior of the cell becomes less negative due to an influx of sodium ions.

Depolarization

The specific period during which potassium ions diffuse out of the neuron due to a change in membrane
permeability.

Repolarization

Period during which the neuron cannot respond to a second stimulus, no matter how strong.

Absolute refractory period

An exceptionally strong stimulus can trigger a response.

Relative refractory period

Called a nerve impulse when transmitted

action potential

Circuits category: Smells are processed by serial pathways. T or F

False

Neurophysiology category: Some ions are prevented from moving down their concentration gradients by
ATP-driven pumps. T or F

True

Potentials category: graded potentials are short-lived. T or F

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

, Converging

CNS, PNS, ANS category: Innervation of skeletal muscle is a function of the autonomic nervous system. T
or F

False

Neurophysiology category: The sodium-potassium pump pumps three sodium ions outside the cell and
two potassium ions inside. T or F

True

Potentials category: An action potential involves impulse propagation dependent on chemically gated ion
channels. T or F

False

Neurophysiology category: Voltage is measured by placing one electrode inside the membrane and
another outside the membrane. T or F

True

Neurons category: Which neuron's primary function is to connect other neurons?
Connective or Association

Association

CNS, PNS, ANS category: Neuroglia that control the chemical environment around neurons by buffering
potassium and recapturing neurotransmitters are astrocytes. T or F

True

Potentials category: An action potential is essential for impulse propagation.

True

Neurons category: What is the part of a neuron that conducts impulses away from its cell body?
Axon or Dendrite

Axon

Potentials category: Which of the following is actively transported through the cell membrane to
establish a resting potential?
Na
Mg
Cl
Ca

Na

CNS, PNS, ANS category: Ependymal cells help to circulate the cerebrospinal fluid. T or F

True

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