Physio Ex 8.0 Exercise 2: Skeletal Muscle Physiology Worksheet

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Exercise 2: Skeletal Muscle Physiology Worksheet
Single Stimulus
Activity 1: Identifying the Latent Period

1.How long is the latent period? 2.78 msec
2.Does the latent period change with different stimulus voltages?No

Activity 2: Identifying the Threshold Voltage

1.What do you see in the Active Force display?I saw a very slight peak at .8 2.What is the threshold voltage? .8 V
3.How does the graph generated at the threshold voltage differ from the graphs generated at voltages below the threshold?There was no movement below the threshold.

Activity 3: Effect of Increases in Stimulus Intensity

1.How did the increases in voltage affect the peaks in the tracings?The peaks rose. 2.How did the increases in voltage affect the amount of active force generated by the muscle?The force increased. 3.What is the voltage beyond which there were no further increases in active force? Maximal voltage: 5.7 V 4.Why is there a maximal voltage? What has happened to the muscle at this voltage? There is a maximum voltage because if there were not the muscles would become injured. At the maximum voltage the muscle has contracted as much as it possibly will. 5.An individual muscle fiber follows the all-or-none principle—it will either contract 100% or not at all. Does the muscle we are working with exhibit the all-or-none principle? Why or why not? No, because it will contract and then relax if needed or to get accustomed

Multiple Stimulus
Activity 4: Treppe

1.What do you observe? The peak rose higher each time

Activity 5: Summation

1.What is the active force of the contraction? 1.62 gms 2.What is the active force now? 2.51 gms
3.Was there any change in the force generated by the muscle? Yes, 1.91 gms 4.Was there any change in the force generated by the muscle? Yes, 2.65 gms 5.Why has the force changed? The muscle stimulated at different intervals. 6.Do you see the same pattern of changes in...
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