PhysioEx Exercise 2 Activity 1

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Biology

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Feb 20, 2024

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2/6/24, 12:59 PM PhysioEx Exercise 2 Activity 1 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act1/ 1/3 PhysioEx Lab Report Exercise 2: Skeletal Muscle Physiology Activity 1: The Muscle Twitch and the Latent Period Name: Sophie Vanderkallen Date: 6 February 2024 Session ID: session-4748ba91-dd66-ca82-bfcb-c7c1a71e11b6 Pre-lab Quiz Results You scored 100% by answering 5 out of 5 questions correctly. Experiment Results Predict Question Stop & Think Questions 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 Predict Question: Will changes to the stimulus voltage alter the duration of the latent period? Your answer: No, changing the stimulus voltage will not change the latent period duration. 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? 2
2/6/24, 12:59 PM PhysioEx Exercise 2 Activity 1 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act1/ 2/3 Experiment Data Post-lab Quiz Results You scored 100% by answering 6 out of 6 questions correctly. Review Sheet Results You correctly answered: All the steps of excitation-contraction coupling occur. An action potential in a motor neuron triggers the release of which neurotransmitter? You correctly answered: acetylcholine. 1 The term skeletal muscle fiber refers to You correctly answered: an individual skeletal muscle cell. 2 The graded depolarization in the skeletal muscle fiber that is elicited in response to one action potential from the motor neuron is called You correctly answered: an EPP (end-plate potential). 3 Which of the following is not a phase of a skeletal muscle twitch? You correctly answered: hyperpolarization phase. 4 A skeletal muscle twitch is You correctly answered: one contractile response to a single action potential. 5 Which of the following correctly matches the twitch phase with its definition? You correctly answered: the contraction phase: the time between the end of the latent period and peak muscle tension. 6 Define the terms skeletal muscle fiber, motor unit, skeletal muscle twitch, electrical stimulus, and latent period. Your answer: skeletal muscle fiber: single muscle cell that consists of skeletal muscle. motor unit: a motor neuron with the muscle fiber it innervates. skeletal muscle twitch: response to a single action potential. electrical stimulus: makes the muscles contract. 1
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