Pre-Lab
Which of the following is described correctly?
Which of the following is described correctly?
Schwann cells provide the myelination in the central nervous system.
Schwann cells provide the myelination in the peripheral nervous system.
Astrocytes provide the myelination in the central nervous system.
Oligodendrocytes provide the myelination in the peripheral nervous system.
The rate with which an action potential travels along an axon _______.
The rate with which an action potential travels along an axon _______.
is measured in meters/sec
is called the conduction velocity and is measured in meters/sec
is called the conduction velocity
is measured in volts/sec
is called the conduction velocity and is measured in volts/sec
Which of the following describes a B fiber?
Which of the following describes a B fiber?
small diameter, lightly myelinated
medium diameter, lightly myelinated
large diameter, lightly myelinated
small diameter, unmyelinated
The nodes of Ranvier are _______.
The nodes of Ranvier are _______.
locations on the axon where the myelin sheath is very heavy
a type of glial cell
trigger zones of an axon
locations on the axon where the myelin sheath is absent
Post-Lab
Which fibers generate the smallest value for conduction velocity?
Which fibers generate the smallest value for conduction velocity?
D fibers
C fibers
B fibers
A fibers
The time interval for conduction would be shortest with
The time interval for conduction would be shortest with
the largest and most heavily myelinated axons
the largest unmyelinated axons
the smallest and most heavily myelinated axons
the smallest unmyelinated axons
Increasing the amount of myelination _______.
Increasing the amount of myelination _______.
has no effect on the time between action potentials
decreases the time between action potentials
increases the time between action potentials
increases the time between action potentials only for small-diameter axons
In this activity, the stimulus voltage used was _______.
In this activity, the stimulus voltage used was _______.
suprathreshold for all of the axons
the same for all of the axons
the same for all of the axons and suprathreshold for all of the axons
altered to accommodate the structural differences
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