BSL PRO Lesson A02 3 of contraction increase as the stimulus Ater reaching the m
ID: 3478774 • Letter: B
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BSL PRO Lesson A02 3 of contraction increase as the stimulus Ater reaching the maximal response, why doesn't the force of contraction increase as e stems, After increases? 4. Does the Latent Period, Duration of Contraction, or Duration of Relaxation change with stimulus strength? Summation, Tetanus and Fatigue Summation Tetanus Normal Twitches Table 2 Duration from onset of tetanus to onset of fatigue:5210 seconds Notes: .Summation begins when the frequency of stimulation increases to a point where the muscle cannot fully relax between stimuli . Each time the stimulus frequency was changed, a stimulus event marker was automatically inserted. The marker label displays the frequency used. To determine the frequencies: Click on the Autoscale Horizontal toolbar button to view all of the data. Zoom in on only the Summation, Tetanus and Fatigue recording. a. b. Find the stimulus event marker that is nearest to the data of interest Click on the event marker (activate it) and read the frequency from the event marker label c. marker Label d. Stimulator event marker Questions 1 Based on the durations of the musdle contractions from the Threshold data, what is the lowest stimulation contr Threshold frequency that should have caused summation?m Note: Frequency (Hz) = 1000/ Pulse Interval ( (msec) trequency the same as the trequenoy measured in your data? same Is your calculated 2 oBIOPAC Systems, Inc Page 18 of 23Explanation / Answer
3. Force cannot increase for a maximal stretched sarcomere. A sarcomere has a limit to expand its actin-myosin crossbridge. That is why increasing stimulus cannot further help in increasing force. After the maximum stimulation, fibres need to repolarize.
4. Stimulus strength if change high or low, we will get same change in latent period. This is because of recruitment of muscle fibres; but this is set to a maximum limit for the optimum strength of stimulus (threshold). On the other hand, increasing the stimulus strength causes increase in duration of contraction and relaxation and the vice versa while decreasing. However, this is also set for a maximum limit as for the latent period had.
1. The number of fibres increases with increasing voltage until each nerve fibre got stimulation. This increases intensity of signals.
2a. Voltage increase perform more muscle fibres to stimulate, this causes more muscle fibres to get in contraction phase. That increases the force value from all activated muscle fibres. Force of muscle produces from contraction of sarcomere.
2b. Yes, this can consider as motor unit recruitment because more motor units will activate by increasing voltage but up to limit of all muscle fibres activation. Motor unit form by connection between a motor neuron and a muscle fibre.
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