PhysioEx Exercise 2 Activity 2

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Georgia State University *

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Apr 3, 2024

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10/23/2020 PhysioEx Exercise 2 Activity 2 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act2/ 1/8 PhysioEx Lab Report Exercise 2: Skeletal Muscle Physiology Activity 2: The Effect of Stimulus Voltage on Skeletal Muscle Contraction Name: Maria Ramirez Date: 23 October 2020 Session ID: session-66cc8e76-0436-6fc0-6c03-c4ecfb180d91 Pre-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. Experiment Results Predict Question Stop & Think Questions Skeletal muscle fibers are innervated (stimulated) by You correctly answered: motor neurons. 1 A single action potential propagating down a motor axon results in You correctly answered: a single action potential and a single contractile event in the muscle fibers it innervates. 2 In resting skeletal muscle, calcium is stored in You correctly answered: the sarcoplasmic reticulum. 3 During the latent period for an isometric contraction You correctly answered: the cellular events involved in excitation-contraction coupling occur. 4 Predict Question: As the stimulus voltage is increased from 1.0 volt up to 10 volts, what will happen to the amount of active force generated with each stimulus? Your answer: The active force will first increase and then plateau at some maximal value as the stimulus voltage increases. 1 What do you observe in the active force display when the stimulus voltage is set to 0.0, and why does this observation make sense? You correctly answered: 0.00; there was no activation of skeletal muscle fibers by this stimulus. 1 i
10/23/2020 PhysioEx Exercise 2 Activity 2 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act2/ 2/8 Experiment Data Voltage (v) Length (mm) Active Force Passive Force Total Force 0.0 75 0.00 0.00 0.00 0.2 75 0.00 0.00 0.00 0.8 75 0.02 0.00 0.02 1.0 75 0.15 0.00 0.15 1.5 75 0.43 0.00 0.43 2.0 75 0.66 0.00 0.66 2.5 75 0.87 0.00 0.87 3.0 75 1.04 0.00 1.04 3.5 75 1.19 0.00 1.19 4.0 75 1.32 0.00 1.32 4.5 75 1.42 0.00 1.42 5.0 75 1.51 0.00 1.51 5.5 75 1.59 0.00 1.59 6.0 75 1.65 0.00 1.65 Voltage = 0.0 V What is the lowest stimulus voltage that induces active force in the skeletal muscle? You correctly answered: threshold voltage. 2 Enter the threshold voltage for this experiment. You answered: 0.8 volts. 3 Enter the maximal voltage for this experiment. You answered: 6.0 volts. 4 i
10/23/2020 PhysioEx Exercise 2 Activity 2 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act2/ 3/8 Voltage = 0.2 V Voltage = 0.8 V Voltage = 1.0 V Voltage = 1.5 V i
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