PhysioEx Lab Report
Exercise 3: Neurophysiology of Nerve Impulses
Activity 7: The Action Potential: Conduction Velocity
Name:
Date:
Session ID:
Pre-lab Quiz Results
You scored 100% by answering 5 out of 5 questions correctly.
1 An action potential can be propagated along an axon because there are _______ channels in the
membrane.
You correctly answered: voltage-gated.
2 The units of conduction velocity are
You correctly answered: meters/second.
3 Which of the following will affect axonal conduction velocity?
You correctly answered: both the diameter of the axon and the amount of myelination.
4 Which of the following describes an A fiber?
You correctly answered: large diameter, heavily myelinated.
5 Which of the following describes a C fiber?
You correctly answered: small diameter, unmyelinated.
Experiment Results
Predict Questions
1 Predict Question 1: How will the conduction velocity in the B fiber compare with that in the A Fiber?
Your answer: The conduction velocity in the B fiber will be slower because the B fiber has a smaller
diameter and less myelination.
2 Predict Question 2: How will the conduction velocity in the C fiber compare with that in the B Fiber?
Your answer: The conduction velocity in the C fiber will be slower because the C fiber has a smaller
diameter and less myelination.
Stop & Think Questions
1 Note the difference in time between the action potential recorded at R1 and the action potential
recorded at R2. The distance between these sets of recording electrodes is 2 centimeters (0.02 m).
Convert the time from milliseconds to seconds, enter the time (in seconds).
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex3/act7/ 1/5
, 27-5-2021 PhysioEx Exercise 3 Activity 7
You answered: 0.002 sec.
2 Calculate the conduction velocity in meters/second by dividing the distance between R1 and R2 (0.02
m) by the time it took for the action potential to travel from R1 to R2.
Enter the conduction velocity.
You answered: 10 m/sec.
3 Note the difference in time between the action potential recorded at R1 and the action potential
recorded at R2.
Convert the time from milliseconds to seconds, enter the time (in seconds).
You answered: 0.01 sec.
4 Calculate the conduction velocity in meters/second by dividing the distance between R1 and R2 (0.02
m) by the time it took for the action potential to travel from R1 to R2.
Enter the conduction velocity.
You answered: 2 m/sec.
5 Note the difference in time between the action potential recorded at R1 and the action potential
recorded at R2.
Convert the time from milliseconds to seconds, enter the time (in seconds).
You answered: 0.1 sec.
6 Calculate the conduction velocity in meters/second by dividing the distance between R1 and R2 (0.02
m) by the time it took for the action potential to travel from R1 to R2.
Enter the conduction velocity.
You answered: 0.2 m/sec.
Experiment Data
Axon Type Myelination Stimulus Distance Time Time Conduction
Voltage From R1 to R2 between between Velocity
(mV) (m) APs (msec) APs (sec) (m/sec)
A fiber Heavy 30 0.02 2 0.002 10
B fiber Light 30 0.02 10 0.01 2
C fiber None 30 0.02 100 0.1 0.2
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