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PEX-02-05 - Exercise 2 Skeletal Muscle Physiology Activity...

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Exercise 2: Skeletal Muscle Physiology: Activity 5: Fatigue in Isolated Skeletal Muscle Lab Report Pre-lab Quiz Results You scored 75% by answering 3 out of 4 questions correctly. 1. When skeletal muscle twitches fuse so that the peaks and valleys of each twitch become indistinguishable from each other, the muscle is in a state known as You correctly answered: d. complete (fused) tetanus. 2. When the stimulus frequency reaches a value beyond which no further increase of skeletal muscle force can occur, the muscle has reached its You correctly answered: c. maximal tetanic tension. 3. A decline in a muscle's ability to maintain a constant level of force, or tension, after prolonged, repetitive stimulation is called You correctly answered: c. fatigue. 4. Which of the following is not thought to be a contributing factor to the development of fatigue? Your answer : b. buildup of lactic acid in the muscle fibers Correct answer: a. buildup of Ca2+ in the muscle fibers 010/05/11 page 1
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010/05/11 page 2 Experiment Results
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