Bio 124 Exam 3 UPDATED A Exam
Questions and CORRECT Answers
Central Nervous System (CNS) - CORRECT ANSWER - Command-and-control center of
the nervous system; integrates and processes nervous information
Peripheral Nervous System (PNS) - CORRECT ANSWER - Projects to and receives info
from CNS
Special Characteristics of Nuerons - CORRECT ANSWER - High Metabolic rate
Extreme longevity
Non-mitotic
Excitable
Conductivity
Functional classification of sensory (Afferent) neurons - CORRECT ANSWER - Carry
impulses from sensory receptors into CNS
Functional classification of Motor (Efferent) neurons - CORRECT ANSWER - Carry
impulses away from the CNS to muscles or glands
Functional classification of Internueron (Associate) - CORRECT ANSWER - Carry
impulses within the CNS
Astrocytes (CNS) - CORRECT ANSWER - large, branching cells that form the blood-
brain barrier
Oligondendrocytes (CNS) - CORRECT ANSWER - Cells with few branches that form
myelin
,Microgilia (CNS) - CORRECT ANSWER - Tiny cells with complex branches and are
phagocytes
Ependymal cells (CNS) - CORRECT ANSWER - ciliated and secrete the cerebrospinal
fluid (CSF)
Neurolemmocyte (PNS) - CORRECT ANSWER - Myelin producing
Satellite cells (PNS) - CORRECT ANSWER - Isolate and nourish cell bodies in ganglion
Main role of axon - CORRECT ANSWER - send nerve impulses
Nerve Impulse (Action Potential) - CORRECT ANSWER - rapid movement of an
electrical charge along an axon's plasma membrane
Neurons are electrically excitable - CORRECT ANSWER - Can be stimulated by a signal
to generate a Nerve Impulse which can travel along the Axon to other neurons, muscles or
glands.
Myelination - CORRECT ANSWER - Allows for the speeding up of the nerve impulse
along the axon
Oligodendrocytes can myelinate... - CORRECT ANSWER - multiple axons
Neurolemmocytes can myelinate... - CORRECT ANSWER - Only one axon
Saltatory Conduction - CORRECT ANSWER - Fast Impulse Transmission: movement of a
nerve from one node to another node
, Continuous Conduction - CORRECT ANSWER - Slow Impulse Transmission: In
unmyelinated axons the nerve impulse travels in one pass
Step 1 of axon regeneration - CORRECT ANSWER - Trauma severs axon
Step 2 of axon regeneration - CORRECT ANSWER - Proximal portion of each severed
axons seals off and swells; Distal portion and myelin sheath disintegrate
Step 3 of axon regeneration - CORRECT ANSWER - neurilemma and endoneurium form
a regeneration tube
Step 4 of axon regeneration - CORRECT ANSWER - axon regenerates and remyelination
occurs
Step 5 of axon regeneration - CORRECT ANSWER - innervation to effector is restored
Axodendritic Synapse - CORRECT ANSWER - Most common; Synaptic knobs of pre-
synaptic neuron interact with DENDRITES of post-synaptic neuron
Axosomatic Synapse - CORRECT ANSWER - Synaptic knob of pre-synaptic neuron
interact with CELL BODY of post-synaptic neuron
Axoaxonic Synapse - CORRECT ANSWER - Synaptic knob of pre-synaptic neuron
interact with SYNAPTIC KNOB of post-synaptic neuron
Gray Matter - CORRECT ANSWER - Houses motor neuron and interneuron cell bodies,
dendrites, terminal arborizations, and unmyelinated axons
Cerebral Cortex - CORRECT ANSWER - External layer of Gray Matter the surrounds the
entire brain
Questions and CORRECT Answers
Central Nervous System (CNS) - CORRECT ANSWER - Command-and-control center of
the nervous system; integrates and processes nervous information
Peripheral Nervous System (PNS) - CORRECT ANSWER - Projects to and receives info
from CNS
Special Characteristics of Nuerons - CORRECT ANSWER - High Metabolic rate
Extreme longevity
Non-mitotic
Excitable
Conductivity
Functional classification of sensory (Afferent) neurons - CORRECT ANSWER - Carry
impulses from sensory receptors into CNS
Functional classification of Motor (Efferent) neurons - CORRECT ANSWER - Carry
impulses away from the CNS to muscles or glands
Functional classification of Internueron (Associate) - CORRECT ANSWER - Carry
impulses within the CNS
Astrocytes (CNS) - CORRECT ANSWER - large, branching cells that form the blood-
brain barrier
Oligondendrocytes (CNS) - CORRECT ANSWER - Cells with few branches that form
myelin
,Microgilia (CNS) - CORRECT ANSWER - Tiny cells with complex branches and are
phagocytes
Ependymal cells (CNS) - CORRECT ANSWER - ciliated and secrete the cerebrospinal
fluid (CSF)
Neurolemmocyte (PNS) - CORRECT ANSWER - Myelin producing
Satellite cells (PNS) - CORRECT ANSWER - Isolate and nourish cell bodies in ganglion
Main role of axon - CORRECT ANSWER - send nerve impulses
Nerve Impulse (Action Potential) - CORRECT ANSWER - rapid movement of an
electrical charge along an axon's plasma membrane
Neurons are electrically excitable - CORRECT ANSWER - Can be stimulated by a signal
to generate a Nerve Impulse which can travel along the Axon to other neurons, muscles or
glands.
Myelination - CORRECT ANSWER - Allows for the speeding up of the nerve impulse
along the axon
Oligodendrocytes can myelinate... - CORRECT ANSWER - multiple axons
Neurolemmocytes can myelinate... - CORRECT ANSWER - Only one axon
Saltatory Conduction - CORRECT ANSWER - Fast Impulse Transmission: movement of a
nerve from one node to another node
, Continuous Conduction - CORRECT ANSWER - Slow Impulse Transmission: In
unmyelinated axons the nerve impulse travels in one pass
Step 1 of axon regeneration - CORRECT ANSWER - Trauma severs axon
Step 2 of axon regeneration - CORRECT ANSWER - Proximal portion of each severed
axons seals off and swells; Distal portion and myelin sheath disintegrate
Step 3 of axon regeneration - CORRECT ANSWER - neurilemma and endoneurium form
a regeneration tube
Step 4 of axon regeneration - CORRECT ANSWER - axon regenerates and remyelination
occurs
Step 5 of axon regeneration - CORRECT ANSWER - innervation to effector is restored
Axodendritic Synapse - CORRECT ANSWER - Most common; Synaptic knobs of pre-
synaptic neuron interact with DENDRITES of post-synaptic neuron
Axosomatic Synapse - CORRECT ANSWER - Synaptic knob of pre-synaptic neuron
interact with CELL BODY of post-synaptic neuron
Axoaxonic Synapse - CORRECT ANSWER - Synaptic knob of pre-synaptic neuron
interact with SYNAPTIC KNOB of post-synaptic neuron
Gray Matter - CORRECT ANSWER - Houses motor neuron and interneuron cell bodies,
dendrites, terminal arborizations, and unmyelinated axons
Cerebral Cortex - CORRECT ANSWER - External layer of Gray Matter the surrounds the
entire brain
