Study the tracings in the oscilloscope below that were made during PhysioEx Exer

Question

Study the tracings in the oscilloscope below that were made during PhysioEx Exercise 2: Skeletal Muscle Physiology, Activity 4: Tetanus in Isolated Skeletal Muscle.

What begins to happen at around 80 msec

A- summation of force ceases B- unfused tetanus develops C- fused tetanus develops D- maximal tetanic tension is reached 6 5 2 0 20 40 60 80 100 120 140 160 180 200 Time (msec) Clear Tracings Force (g) Multiple Stimuli Voltage (V) 8.5 Stimulilsec 50 5.12 Active 0.00 Passive 5.12 Total Muscle Length 75 Voltage Length Stimuli/sec Act. Force Pass.Force Total Force 5.12 Record Data 8.5 75 50 5.12 0.00

Explanation / Answer

Around 80msec, maximal tetanic tension is reached.

Beyond 146 stimuli/sec , there is no further increase in the peak force.

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