PEX-02-03 - Exercise 2: Skeletal Muscle Physiology:...

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Exercise 2: Skeletal Muscle Physiology: Activity 3: The Effect of Stimulus Frequency on Skeletal Muscle Contraction Lab Report Pre-lab Quiz Results You scored 75% by answering 3 out of 4 questions correctly. 1. During a single twitch of a skeletal muscle Your answer : c. no force is produced unless the muscle shortens. Correct answer: b. maximal force is never achieved. 2. When a skeletal muscle is repetitively stimulated, twitches can overlap each other and result in a stronger muscle contraction than a stand-alone twitch. This phenomenon is known as You correctly answered: c. wave summation. 3. Wave summation is achieved by You correctly answered: a. increasing the stimulus frequency (the rate of stimulus delivery to the muscle). 4. Wave summation increases the force produced in the muscle. Another way to increase the force produced by a muscle is to You correctly answered: d. increase the number of activated motor units. 010/05/11 page 1
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010/05/11 page 2 Experiment Results Predict Question: Predict Question 1: As the stimulus frequency increases, what will happen to the muscle force generated with each successive stimulus? Will there be a limit to this response? Your answer : d. As the stimulus frequency increases, the muscle force generated by each successive stimulus will first
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