PhysioEx Exercise 2 Activity 6

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Feb 20, 2024

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2/6/24, 1:50 PM PhysioEx Exercise 2 Activity 6 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act6/ 1/3 PhysioEx Lab Report Exercise 2: Skeletal Muscle Physiology Activity 6: The Skeletal Muscle Length-Tension Relationship Name: Sophie Vanderkallen Date: 6 February 2024 Session ID: session-e64cf587-cf67-2739-102d-182749161ec7 Pre-lab Quiz Results You scored 100% by answering 5 out of 5 questions correctly. Experiment Results Predict Question Stop & Think Question During an isometric contraction You correctly answered: the skeletal muscle is generating force, but it remains at a fixed length. 1 The force that results from muscles being stretched is You correctly answered: passive force. 2 Active force You correctly answered: is determined by the amount of myosin bound to actin. 3 When you generate the isometric length-tension curve, which of the following forces will not be indicated on your screen? You correctly answered: tetanic force. 4 Passive force in skeletal muscle is largely caused by You correctly answered: the protein titin. 5 Predict Question: As the resting length of the muscle is changed, what will happen to the amount of total force the muscle generates during the stimulated twitch? Your answer: Total force can increase or decrease depending upon the starting resting length. 1
2/6/24, 1:50 PM PhysioEx Exercise 2 Activity 6 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act6/ 2/3 Experiment Data Post-lab Quiz Results You scored 100% by answering 5 out of 5 questions correctly. Review Sheet Results Note the dip in total force at a muscle length of 90 mm as compared to the total force at a muscle length of 80 and 100 mm. Why does this occur? You correctly answered: At this muscle length, active force has decreased in value and passive force has not yet increased to a significant value. 1 When a skeletal muscle is stimulated and generates force but remains at a fixed length You correctly answered: the muscle is contracting isometrically. 1 Which protein is mostly responsible for the development of passive force in a muscle? You correctly answered: titin. 2 In skeletal muscle, active force stimulated through a range of muscle lengths You correctly answered: will utilize ATP hydrolysis to drive the cross bridge cycle. 3 Which of the following is not depicted in a typical skeletal muscle isometric length-tension curve? You correctly answered: time. 4 Maximal active tension will be produced in a skeletal muscle fiber when You correctly answered: the fiber is at its resting length. 5 What happens to the amount of total force the muscle generates during the stimulated twitch? How well did the results compare with your prediction? Your answer: correct. 1 What is the key variable in an isometric contraction of a skeletal muscle? Your answer: muscle length. 2
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