Physioex 8.0 Exercise 3

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Activity 1: Electrical Stimulation

1.Do you see any kind of response on the oscilloscope screen? NO 2.What was the threshold voltage, or the voltage at which you first saw an action potential? 3.0 V 3.How does this tracing compare to the one that was generated at the threshold voltage? The tracing travel in the same fashion but the tracing were different with an increase threshold voltage 4.What reason can you give for the change? Increase voltage 5.Record this maximal voltage here: 6.0 V

Activity 2: Mechanical Stimulation

1.When the glass rod is touching the nerve, what do you see on the oscilloscope screen? The nerve’s action potential to stimuli 2.How does this tracing compare with the other tracings you have generated? They are traced in the same fashion

Activity 3: Thermal Stimulation

1.What happens when the heated rod touches the nerve? Action potential in increased 2.How does this trace compare to the trace that was generated with the unheated glass bar? The tracing were similar but the heat increase the action potential 3.What explanation can you provide for this? The heat stimuli generated a stronger nerve impulse

Activity 4: Chemical Stimulation

1.Does the sodium chloride generate an action potential? Yes 2.Does this tracing differ from the original threshold stimulus tracing? If so, how? No, they are the same. 3.Does the hydrochloric acid generate an action potential? Yes 4.Does this tracing differ from the original threshold stimulus tracing? If so, how? No. 5.To summarize your experimental results, what kinds of stimuli can elicit an action potential? Any stimuli that has a strong enough threshold stimulus such as physical stimulation such as heat or chemical stimulation such as sodium chloride.

Inhibiting a Nerve Impulse
Activity 5: Testing the Effects of Ether

1.What sort of trace do you see? Flat trace
2.What has happened to the nerve? Ether blocked the nerve impulse transmission to another...
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