Skeletal Muscle Physiology Physioex Exercise 2

1761 Words Sep 7th, 2012 8 Pages
I have only listed the questions that required answers that are a part of this exercise.

A C T I V I T Y 1
Identifying the Latent Period
How long is the latent period? _____2.78____ msec

Note: If you wish to print your graph, click Tools on the menu bar and then click Print Graph.

5. Increase or decrease the stimulus voltage and repeat the experiment. (Remember that you can clear the tracings on the screen at any time by clicking Clear Tracings.) Record your data here:

Stimulus Latent voltage: ____4.0____ V period: ____2.78____ msec

Stimulus Latent voltage: ____3.0____ V period: ___2.78_____ msec

Stimulus Latent voltage: ___10.0_____ V period: ____2.78____ msec

Does the latent period change with different stimulus
voltages?
…show more content…
A C T I V I T Y 6
Tetanus
4. Click Multiple Stimulus and watch the trace as it moves across the screen. You will notice that the Multiple Stimulus button changes to a Stop Stimulus button as soon as it is clicked. After the trace has moved across the full screen and begins moving across the screen a second time, click the Stop
Stimulus button.

What begins to happen at around 80 msec?
Hits a plateau.

What is this condition called?
Tetanus.

5. Leave the trace on the screen. Increase the Stimuli/sec setting to 130 by clicking the (_) button. Then click Multiple
Stimulus and observe the trace. After the trace has moved across the full screen and begins moving across the screen a second time, click Stop Stimulus.

How does the trace at 130 stimuli/sec compare with the trace at 50 stimuli/sec?
The twitches have fused.

What is this condition called?
Complete (fused) tetanus.

9. Examine your data. At what stimulus frequency is there no further increase in force?
146 stimuli/second

What is this stimulus frequency called?
Maximal titanic tension.

11. Click Clear Tracings to clear the oscilloscope screen. If you wish to print your data, click Tools and then Print Data.

A C T I V I T Y 7
Fatigue

1. Design an experiment that demonstrates fatigue on the oscilloscope screen. Hint: Set Stimuli/sec to above 100.
In fatigue, what happens to force production over time?
The muscle is unable to
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