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Home Q & A Board Biology-Related Homework Help Anatomy and Physiology
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Vickys05 Vickys05
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12 years ago
The effects of stimulus frequency on skeletal muscle contractioin

1.   What is the difference between stimulus intensity and stimulus frequency?

2.   In this experiment you observed the effect of stimulating the isolated skeletal muscle multiple times in a short period with complete relaxation between the stimuli.  Describe the force of contraction with each subsequent stimulus.  Is this called treppe or wave summation?

 3.   How did the frequency of stimulation affect the amount of force generated by the isolated skeletal muscle when the frequency of stimulation was increased such that the muscle twitches did not fully relax between subsequent stimuli?  Is this called treppe or wave summation?

4.   To achieve an active force of 5.2 g, did you have to increase the stimulus voltage above 8.5 volts? If not, how did you achieve an active force of 5.2 g?
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#1
Valued Member
12 years ago
Quote from: Vickys05 (12 years ago)
1.   What is the difference between stimulus intensity and stimulus frequency?

Stimulus Intensity is the strength of Apmlitude of the stimulus. For examply being punched in the arm lightly will cause the Sensation of just a little pain the stimulus (the sudden pressure) has a low intensity. But being punched harder will cause the sensation of more pain because the stimulus has a higher intensity. This increase in paion Perception is due to the fact that some of the sensory neurones are harder to activate than others so they will only send their implulses when a greater stimulus is presented. Stimulus Frequency on the other hand is the number of times per unit time that the stimulus is presented. To continue the original example if the arm was then puched only very slowly it would be said to have a low frequence but to puch faster would increase the frequency.
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#2
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12 years ago
Quote from: Vickys05 (12 years ago)
2.   In this experiment you observed the effect of stimulating the isolated skeletal muscle multiple times in a short period with complete relaxation between the stimuli.  Describe the force of contraction with each subsequent stimulus.  Is this called treppe or wave summation?

The force generated increases slightly with each subsequent stimulus. As long as stimuli are delivered relatively close together, the active force produced by subsequent stimuli slightly increases for the first few stimuli.
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#3
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12 years ago
Quote from: Vickys05 (12 years ago)
4.   To achieve an active force of 5.2 g, did you have to increase the stimulus voltage above 8.5 volts? If not, how did you achieve an active force of 5.2 g?

Active force increases until the optimal length is obtained, then decreases as muscle length continues to increase beyond optimal length. As long as stimuli are delivered relatively close together, the active force produced by subsequent stimuli slightly increases for the first few stimuli.
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