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...In the experiment on tetanus, I hypothesized that as the stimulus interval lowered the number of contractions would decrease due to the high frequency of stimuli innervating the muscle before the previous muscle twitches were complete to summate. As the stimuli sum and the number of contractions decrease, I expected the resulting contractions to increase in strength due to summation of the stimuli. As the stimulus interval further decreased, I expected the muscle would undergo one prolonged contraction at maximum force. I expected this result, because the stimulus frequency would be increased to the point where calcium would not be pumped out of the sarcoplasm. Therefore, the myosin heads would remain attached to the actin filaments resulting in contraction without relaxation between pulses and the large number of stimuli would cause all motor units to be activated.
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