PhysioEx 9.1 Exercise 2: Skeletal Muscle Physiology, Activity 2: The Effect of S

Question

PhysioEx 9.1 Exercise 2: Skeletal Muscle Physiology, Activity 2: The Effect of Stimulus Voltage on Skeletal Muscle Contraction (2).

The tracings on the oscilloscope below were from PhysioEx Exercise 2: Skeletal Muscle Physiology, Activity 2: The Effect of Stimulus Voltage on Skeletal Muscle Contraction.

For a single muscle twitch, what happens if you increase the stimulus voltage?

A- Total force will increase by releasing more calcium B- Passive forve will increase by activating more titin proteins C- Active force decreases by inhibiting less muscle fibers to contract D- Activity force increases by recruiting muscle fibers to contract 2 20 40 60 80 100 120 140 Time (msec) Plot Data Clear Tracings Force (g) Stimulate 1.82 Active 0.00 Passive 1.82 Total Voltage (V) 10.0 Muscle Length 75 Length 75 75 75 75 Total Force 1.65 1.70 1.74 1.78 Active Force Passive Force Voltage 6.0 6.5 7.0 7.5 1.65 1.70 1.74 1.78 0.00 0.00 0.00 0.00 Record Data

Explanation / Answer

The plot reading suggests that there is no Passive force for the 10.0 voltage. Therefore, by increasing the voltage the active force will also increase until the plateau phase. That phase will come after high voltage applies. Mostly the range is between 65 V to 90 V. Therefore, the option-D is correct.

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