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Exercise 3: Neurophysiology of Nerve Impulses Activity 3: The Action Potential: Threshold
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PhysioEx Exercise 3 Activity 3 Exercise 3: Neurophysiology of Nerve Impulses Activity 3: The Action Potential: Threshold
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27-5-2021 PhysioEx Exercise 3 Activity 3PhysioEx Lab Report
Exercise 3: Neurophysiology of Nerve Impulses
Activity 3: The Action Potential: Threshold
Name:
Date:
Session ID:
Pre-lab Quiz Results
You scored 75% by answering 3 out of 4 questions correctly. 1 Axons
are
You correctly answered: long, thin structures that extend from a neuronal cell body.
2 Which of the following is easier?
You correctly answered: Extracellular recordings of the action potential.
3 An action potential is usually initiated in an axon at or near
Your answer: the trigger zone.
Correct answer: all of the above.
4 The initiation of an action potential in a sensory neuron in the body normally
You correctly answered: follows a sufficiently large depolarizing receptor potential.
Experiment Results
Predict Question
1 Predict Question: How will the action potential at R1 (or R2) change as you continue to increase the
stimulus voltage?
Your answer: The peak value of the action potential will increase.
Stop & Think Questions
1 Why is the action potential recorded by the second recording electrode (R2) delayed relative to the
action potential recorded by the first recording electrode (R1)?
You correctly answered: The action potential had to propagate from R1 to R2.
2 An increase in extracellular K+ would depolarize a neuron. This depolarization would occur if neurons
were damaged. From what you have just learned about generating an action potential, what effect
would this have on nearby axons? The nearby axonal membranes will _______.
You correctly answered: be depolarized to values near or above threshold voltages.
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex3/act3/ 1/4
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