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The Effect of Stimulus Voltage on Skeletal Muscle Contraction Lab Report Pre-lab Quiz Results You scored 25% by answering 1 out of 4 questions correctly. 1. Skeletal muscle fibers are innervated (stimulated) by You correctly answered: c. motor neurons. 2. A single action potential propagating down a motor axon results in Your answer : a. several action potentials and several contractile events in the muscle fibers it innervates. Correct answer: d. single action potential and a single contractile event in the muscle fibers it innervates.

 In resting skeletal muscle, calcium is stored in Your answer : a. the sarcomere. Correct answer: c. the sarcoplasmic reticulum. 4. During the latent period for an isometric contraction Your answer : a. the actin and myosin filaments slide past each other, causing the muscle to shorten. Correct answer: c. the cellular events involved in excitation-contraction coupling occur. 05/09/13 page 1 Experiment Results Predict Question: Predict Question: As the stimulus voltage is increased from 1. volt up to 10 volts, what will happen to the amount of active force generated with each stimulus? Your answer : a. The active force will continually increase. Stop & Think Questions: What do you see in the active force display when the stimulus voltage is set to 0. 0, and why does this observation make sense? You correctly answered: a. 0. 00 g; there was no activation of skeletal muscle fibers by this stimulus. What is the lowest stimulus voltage that induces active force in the skeletal muscle? You correctly answered: b. threshold voltage.

The maximal voltage induces the most calcium release from a muscle fiber’s sarcoplasmic reticulum. Correct answer: b. At the maximal voltage, all the muscle fibers contained in this muscle are depolarized and they all develop active force (that is, they were all successfully recruited). 5/09/13 page 11 Review Sheet Results 1. Describe the effect of increasing stimulus voltage on isolated skeletal muscle. Specifically, what happened to the muscle force generated with stronger electrical stimulations and why did this change occur? How well did the results compare with your prediction? You did not answer this question. 2. How is this change in whole-muscle force achieved in vivo? You did not answer this question. 3. What happened in the isolated skeletal muscle when the maximal voltage was applied? You did not answer this question.



This paper will analyze a text. “Text” is defined as anything that is “read” or interpreted. This paper should focus on how texts are interpreted or how meaning is created. Secondary research should be used, and primary research may be used if appropriate to the topic. A successful paper will interact with multiple sources, build one’s own ideas upon those sources, and argue logically. 6 Sources

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