Answer :
Final answer:
As stimulus frequency increases, muscle force generated increases due to temporal summation, but there is a limit. This limit occurs when muscle contractions reach tetanus, preventing further force generation. Eventually, at excessively high frequencies, force can decrease due to fatigue.
Explanation:
The Effect of Stimulus Frequency on Skeletal Muscle Contraction
As the stimulus frequency increases, the muscle force generated by each successive stimulus will increase due to a phenomenon known as temporal summation. This occurs when the muscle does not have enough time to relax between stimuli, resulting in a stronger contraction with each additional stimulus. However, there is a limit to this increase; at very high frequencies, the muscle may enter a state known as tetanus, where the muscle contraction reaches a maximum level and might not be able to produce any more force despite increased frequency.
In practice, as you increase the stimulus frequency, you will observe:
- Initially, an increase in force with each successive stimulus.
- A plateau phase where the force generated stabilizes.
- Finally, if the frequency becomes excessively high, a decrease in the force may occur due to fatigue or other physiological limits.
Conclusion
Therefore, the correct statement is: As the stimulus frequency increases, the muscle force generated by each successive stimulus will increase. There will be a limit to this increase as muscles reach their maximum contraction strength.
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