Skeletal Muscle Physiology Physioex Exercise 2
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? ____No____
A C T I V I T Y 2
Identifying the Threshold Voltage
2. Click Stimulate. What do you see in the Active Force display? 0.00
7. Print out the graph(s) that you see on the oscilloscope screen by clicking Tools at the top of the screen and then selecting
Print Graph.
What is the threshold voltage? ____0.8____ V
How does the graph generated at the threshold voltage differ from the graphs generated at voltages below the threshold?
There is no movement below the threshold. However, there is a tiny increase between 10 and 50 of the force line.
A C T I V I T Y 3
Effect of Increases in
Stimulus Intensity
3. Observe your tracings. How did the increases in voltage affect the peaks in the tracings?
They increased with each increase in voltage.
How did the increases in voltage affect the amount of active force generated by the muscle?
The force increased.
What is the voltage beyond which there were no further increases in active force? Maximal voltage: ____8.5____ V
Why is there a maximal voltage? What has happened to the muscle at this voltage? Keep in mind that the muscle we are working with consists of many individual muscle fibers.
For the prevention of damage to the muscle. The muscle fibers cannot contract any further.
An
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? ____No____
A C T I V I T Y 2
Identifying the Threshold Voltage
2. Click Stimulate. What do you see in the Active Force display? 0.00
7. Print out the graph(s) that you see on the oscilloscope screen by clicking Tools at the top of the screen and then selecting
Print Graph.
What is the threshold voltage? ____0.8____ V
How does the graph generated at the threshold voltage differ from the graphs generated at voltages below the threshold?
There is no movement below the threshold. However, there is a tiny increase between 10 and 50 of the force line.
A C T I V I T Y 3
Effect of Increases in
Stimulus Intensity
3. Observe your tracings. How did the increases in voltage affect the peaks in the tracings?
They increased with each increase in voltage.
How did the increases in voltage affect the amount of active force generated by the muscle?
The force increased.
What is the voltage beyond which there were no further increases in active force? Maximal voltage: ____8.5____ V
Why is there a maximal voltage? What has happened to the muscle at this voltage? Keep in mind that the muscle we are working with consists of many individual muscle fibers.
For the prevention of damage to the muscle. The muscle fibers cannot contract any further.
An