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Contractions in skeletal muscle are regulated by stimulus strength, stimulus frequency, and sarcomere length.
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Contractions in skeletal muscle are regulated by stimulus strength, stimulus frequency, and sarcomere length 425-55-6522 BIOL 4161 November 2, 2004 Abstract The electrical responses and muscle contractions of the skeletal muscle of Rana pippiens in response to various stimulus strengths, stimulus frequencies, and muscle stretch were studied in this experiment. We identified the minimum stimulus voltage required to produce a muscle twitch. Electromyogram (EMG) generally increased in response to increasing stimulus strength. Recordings of contraction force and the duration of the muscle twitch showed no distinct pattern over increasing stimulus strength. The time between the stimulus pulse and the start of the contraction decreased with increasing stimulus strength. The time delay from the start of the muscle contraction until the maximum tension was reached generally decreased with increasing stimulus strength. Baseline tension of the muscle increased with increasing frequency of a stimulus pulse. Change in baseline tension of the muscle showed a general increase with...
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