PhysioEx Exercise 2 Activity 7

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California State University, Northridge *

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Mechanical Engineering

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Dec 6, 2023

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3/16/23, 6:51 PM PhysioEx Exercise 2 Activity 7 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act7/ 1/5 PhysioEx Lab Report Exercise 2: Skeletal Muscle Physiology Activity 7: Isotonic Contractions and the Load-Velocity Relationship Name: Gabriel Sanchez Date: 16 March 2023 Session ID: session-12a9499c-8a35-ffff-3c0e-f9f45040832a Pre-lab Quiz Results You scored 100% by answering 5 out of 5 questions correctly. Experiment Results Predict Question Stop & Think Question During an isotonic concentric contraction, the You correctly answered: force generated by the muscle is greater than the weight of the attached load. 1 During an isotonic concentric contraction You correctly answered: the latent period increases with heavier loads. 2 During the latent period for an isotonic concentric contraction You correctly answered: cross bridges cycle and, when muscle tension exceeds the load, muscle shortening occurs. 3 Muscle shortening velocity You correctly answered: decreases with heavier loads. 4 An isotonic contraction of a muscle is one in which You correctly answered: the length of the muscle changes. 5 Predict Question: As the load on the muscle increases , what will happen to the latent period, the shortening velocity, the distance that the weight moves, and the contraction duration? Your answer: The latent period will increase, the shortening velocity will decrease, the distance will decrease, and the contraction duration will decrease. 1
3/16/23, 6:51 PM PhysioEx Exercise 2 Activity 7 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act7/ 2/5 Experiment Data Voltage (v) Length (mm) Weight (g) Velocity* (mm/ms) Distance Lifted (mm) Time (contracting) Time (relaxing) Twitch Duration (total) 8.5 75 0.5 0.100 4.0 40.00 38.00 78.00 8.5 75 1.0 0.057 2.0 35.00 14.00 49.00 8.5 75 1.5 0.022 0.5 23.00 7.00 30.00 8.5 75 2.0 0.000 0.0 0.00 0.00 0.00 *Distance divided by time (contracting). weight = 0.5 g duration of twitch = 78.00 msec velocity = 0.100 mm/msec distance lifted = 4.0 mm weight = 1.0 g duration of twitch = 49.00 msec velocity = 0.057 mm/msec distance lifted = 2.0 mm What kind of contraction did you observe when you attached the 2.0 gram weight to the skeletal muscle and stimulated a contraction? You correctly answered: isometric. 1
3/16/23, 6:51 PM PhysioEx Exercise 2 Activity 7 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act7/ 3/5 weight = 1.5 g duration of twitch = 30.00 msec velocity = 0.022 mm/msec distance lifted = 0.5 mm weight = 2.0 g duration of twitch = 0.00 msec velocity = 0.000 mm/msec distance lifted = 0.0 mm Post-lab Quiz Results You scored 100% by answering 6 out of 6 questions correctly. Which of the weights allowed the fastest muscle shortening velocity? You correctly answered: 0.5-g weight. 1 Which of the weights induced the longest latent period of the muscle contraction? 2
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