Solved by ramonistry
Exercise 3: Neurophysiology of Nerve Impulses: Activity 6: The Action Potential: Coding for Stimulus Intensity Lab Report
Pre-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.
- The time after an action potential when a second action potential cannot be generated no matter how intense the
stimulus is called the
You correctly answered: b. absolute refractory period.
- The time after an action potential when a second action potential can be generated only if the stimulus intensity is
increased is called the
You correctly answered: c. relative refractory period.
- The term frequency refers to
You correctly answered: c. the number of action potentials per second.
- The purpose of this activity is to explore
You correctly answered: b. the relationship between stimulus intensity and the frequency of action potentials.
Experiment Results
You have not completed the Experiment.
Experiment Data:
Post-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.
- If the interval between action potentials (the interspike interval) is 0.1 (1/10) seconds, what frequency of action potentials
would be observed?
You correctly answered: c. 10 Hz
- With a prolonged stimulus that is just above (more depolarized than) threshold, you would expect to get additional action
potentials when the membrane has completed
You correctly answered: b. the absolute and relative refractory periods.
- Which of the following changes occurs when you increase the stimulus intensity?
You correctly answered: c. The frequency of action potentials increases.
- The absolute refractory period is about 3.75 msec. What intensity stimulus would produce action potentials with this
interspike interval?
You correctly answered: d. None of these stimuli would produce action potentials at this high frequency.
Review Sheet Results
- Why are multiple action potentials generated in response to a long stimulus that is above threshold?
Your answer:
a long stimulus that is above threshold occurs action potential after the relative refractory period.
- Why does the frequency of action potentials increase when the stimulus intensity increases? How well did the results
compare with your prediction?
Your answer:
The frequency of action potentials increases because the increasing stimulus intensity can trigger more action potentials
with the refractory period.
- How does threshold change during the relative refractory period?
Your answer:
Threshold increses.
- What is the relationship between the interspike interval and the frequency of action potentials?
Your answer:
they are interactive.
