Study the figure below which was generated during PhysioEx Exercise 2: Skeletal

Question

Study the figure below which was generated during PhysioEx Exercise 2: Skeletal Muscle Physiology, Activity 5: Fatigue in Isolated Muscle.

Why did the length of the intervening rest period affect the length of time the skeletal muscle can maintain tension once the stimulator is turned on again?

A- Intracellular concentrations of ADP and Pi declined during the rest period B- Intracellular concentrations of acetylcholine increased during the rest period C- calcium levels in sarcoplasmic reticulum declined during the rest period D- Intracellular concentrations of lactic acid increased during the rest period 6 fatigue fatigue fatigu 03 2 rest rest 40 50 60 70 80 0 10 20 30 40 0 60 70 80 90 100 Time (sec) Clear Tracings Timer (sec) Multiple Stimuli Voltage (V) Force (g) 5.86 0.00 86 Active Passive Total Stimuli/sec 120 8.5 5. Muscle Length 75 Voltage Stimuli/sec Rest Period Active Force Sustained Maximal (sec) Force (sec) 8.5 8.5 8.5 120 120 120 5.86 5.86 5.86 10 0.60 5.00 Record Data 20

Explanation / Answer

B .. as during d resting period acetylcholine reservoirs are replenished..which is needed for muscle contraction.

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