PhysioEx Exercise 2 Activity 1

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University of Texas, El Paso *

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2311

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Biology

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Jan 9, 2024

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pdf

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10/3/23, 11:27 AM PhysioEx Exercise 2 Activity 1 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act1/ 1/8 PhysioEx Lab Report Exercise 2: Skeletal Muscle Physiology Activity 1: The Muscle Twitch and the Latent Period Name: Elijah Rascon Date: 3 October 2023 Session ID: session-482d9f34-c9a7-c299-7d5d-106767e736b2 Pre-lab Quiz Results You scored 100% by answering 5 out of 5 questions correctly. Experiment Results Predict Question Skeletal muscles are connected to bones by You correctly answered: tendons. 1 Skeletal muscles are composed of hundreds to thousands of individual cells called You correctly answered: fibers. 2 The term motor unit refers to You correctly answered: one motor neuron and all of the skeletal muscle fibers it innervates. 3 The motor neuron and muscle fiber intersect at what is called You correctly answered: the neuromuscular junction. 4 A twitch is You correctly answered: one contractile response to a single action potential. 5
10/3/23, 11:27 AM PhysioEx Exercise 2 Activity 1 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act1/ 2/8 Stop & Think Questions Experiment Data Voltage (v) Length (mm) Active Force Passive Force Total Force Latent Period (msec) 0 75 0 0 0 ---- 3 75 1.04 0 1.04 ---- 4 75 1.32 0 1.32 3.20 2 75 0.66 0 0.66 3.20 4 75 1.32 0 1.32 3.20 6 75 1.65 0 1.65 3.20 8 75 1.81 0 1.81 3.20 10 75 1.82 0 1.82 3.20 Predict Question: Will changes to the stimulus voltage alter the duration of the latent period? Your answer: Yes, changing the stimulus voltage will change the latent period duration proportionately. 1 What is the period of time that elapses between the generation of an action potential and the start of muscle tension development in a muscle fiber? You correctly answered: The latent period. 1 What occurs during the latent period of these isometric contractions? You correctly answered: All the steps of excitation-contraction coupling occur. 2
10/3/23, 11:27 AM PhysioEx Exercise 2 Activity 1 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act1/ 3/8 Voltage = 0 V Voltage = 3 V
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