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    Pex 03 07

    Uploaded by

    Maryama Aflaha
    The document summarizes a student's lab report on conduction velocity in different nerve fibers. The student scored perfectly on pre-lab quizzes by correctly answering questions about action potentials, conduction velocity units, and factors affecting velocity. Their predictions and experimental results showed that conduction velocity was fastest in A fibers and slowest in C fibers due to differences in diameter and myelination. Changing the oscilloscope timescale was needed to measure the slower C fiber velocity.

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    Pex 03 07

    Uploaded by

    Maryama Aflaha
    39 views6 pages
    The document summarizes a student's lab report on conduction velocity in different nerve fibers. The student scored perfectly on pre-lab quizzes by correctly answering questions about action potentials, conduction velocity units, and factors affecting velocity. Their predictions and experimental results showed that conduction velocity was fastest in A fibers and slowest in C fibers due to differences in diameter and myelination. Changing the oscilloscope timescale was needed to measure the slower C fiber velocity.

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    PEX-03-07

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    The document summarizes a student's lab report on conduction velocity in different nerve fibers. The student scored perfectly on pre-lab quizzes by correctly answering questions about action potentials, conduction velocity units, and factors affecting velocity. Their predictions and experimental results showed that conduction velocity was fastest in A fibers and slowest in C fibers due to differences in diameter and myelination. Changing the oscilloscope timescale was needed to measure the slower C fiber velocity.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    39 views6 pages

    Pex 03 07

    Uploaded by

    Maryama Aflaha
    The document summarizes a student's lab report on conduction velocity in different nerve fibers. The student scored perfectly on pre-lab quizzes by correctly answering questions about action potentials, conduction velocity units, and factors affecting velocity. Their predictions and experimental results showed that conduction velocity was fastest in A fibers and slowest in C fibers due to differences in diameter and myelination. Changing the oscilloscope timescale was needed to measure the slower C fiber velocity.

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    You are on page 1of 6

    Name: Tarissa Diandra Putri Wibowo

    Exercise 3: Neurophysiology of Nerve Impulses: Activity 7: The Action Potential: Conduction Velocity Lab Report

    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: d. voltage-gated

    2. The units of conduction velocity are


    You correctly answered: d. meters/second.

    3. Which of the following will affect axonal conduction velocity?


    You correctly answered: c. both the diameter of the axon and the amount of myelination

    4. Which of the following describes an A fiber?


    You correctly answered: a. large diameter, heavily myelinated

    5. Which of the following describes a C fiber?


    You correctly answered: c. small diameter, unmyelinated

    03/24/21 page 1
    Experiment Results
    Predict Question:
    Predict Question 1: How will the conduction velocity in the B fiber compare with that in the A Fiber?
    Your answer : b. The conduction velocity in the B fiber will be slower because the B fiber has a smaller diameter and less
    myelination.

    Predict Question 2: How will the conduction velocity in the C fiber compare with that in the B Fiber?
    Your answer : b. The conduction velocity in the C fiber will be slower because the C fiber has a smaller diameter and less
    myelination.

    Stop & Think Questions:


    3. 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 10 centimeters (0.1 m).

    Convert the time from milliseconds to seconds, enter the time (in seconds) in the field below, and then click Submit Data to
    display your results in the grid.
    You answered: .002 sec

    4. Calculate the conduction velocity in meters/second by dividing the distance between R1 and R2 (0.1 m) by the time it took
    for the action potential to travel from R1 to R2.

    Enter the conduction velocity in the field below and then click Submit Data to display your results in the grid.
    You answered: 50 m/sec

    7. 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) in the field below, and then click Submit Data to
    display your results in the grid.
    You answered: .01 sec

    8. Calculate the conduction velocity in meters/second by dividing the distance between R1 and R2 (0.1 m) by the time it took
    for the action potential to travel from R1 to R2.

    Enter the conduction velocity in the field below and then click Submit Data to display your results in the grid.
    You answered: 10 m/sec

    11. 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) in the field below, and then click Submit Data to
    display your results in the grid.
    You answered: .1 sec

    12. Calculate the conduction velocity in meters/second by dividing the distance between R1 and R2 (0.1 m) by the time it
    took for the action potential to travel from R1 to R2.

    Enter the conduction velocity in the field below and then click Submit Data to display your results in the grid.
    You answered: 1 m/sec

    03/24/21 page 2
    Experiment Data:

    Axon Type Myelination Stimulus Distance From Time Between Time Between Conduction
    Voltage (mV) R1 to R2 (m) APs (msec) APs (sec) Velocity (m/sec)
    A fiber Heavy 30 0.1 2 .002 50
    B fiber Light 30 0.1 10 .01 10
    C fiber None 30 0.1 100 .1 1

    03/24/21 page 3
    03/24/21 page 4
    Post-lab Quiz Results
    You scored 100% by answering 4 out of 4 questions correctly.

    1. Action potential conduction velocity is fastest in which of the following fibers?


    You correctly answered: a. A fibers

    2. Action potential conduction velocity is slowest in which of the following fibers?


    You correctly answered: c. C fibers

    3. Why did the timescale have to be changed to measure the conduction velocity of the C fibers?
    You correctly answered: b. The total time shown on the oscilloscope would have been too short to see the action potential at
    R2.

    4. The axons from touch fibers are A fibers, and the axons from pain fibers are C fibers. When you stub your toe, which
    would you expect to perceive first?
    You correctly answered: b. your toe touching something

    03/24/21 page 5
    Review Sheet Results
    1. How did the conduction velocity in the B fiber compare with that in the A Fiber? How well did the results compare with
    your prediction?
    Your answer:
    My results compared well with my prediction. Fiber B has a slower conduction velocity because it has the smaller
    diameterand less myelination.

    2. How did the conduction velocity in the C fiber compare with that in the B Fiber? How well did the results compare with
    your prediction?
    Your answer:
    The velocity of B fibers is faster as I predicted.

    3. What is the effect of axon diameter on conduction velocity?


    Your answer:
    A greater layer or amount of myelin around the axon allows for a faster conduction velocity.

    4. What is the effect of the amount of myelination on conduction velocity?


    Your answer:
    Each had a different radius and thickness of myelination and affected the amount of conduction velocity produced.

    5. Why did the time between the stimulation and the action potential at R1 differ for each axon?
    Your answer:
    The amount of myelin on each axon changed the time.

    6. Why did you need to change the timescale on the oscilloscope for each axon?
    Your answer:
    Because, when conduction velocity slowed, there was a need for a longer time to record an action potential.

    03/24/21 page 6

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