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

2/6/24, 1:50 PM PhysioEx Exercise 2 Activity 6 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act6/ 3/3 Based on the unique arrangement of myosin and actin in skeletal muscle sarcomeres, explain why active force varies with changes in the muscle's resting length. Your answer: active force is correlated whether a muscle is shortened or lengthened actin is the thin line in the sarcomere myosin is the thick line in the sarcomere sarcomere is where the myofilaments are located myofilaments includes the actin and myosin sarcomere is responsible for pulling the myosin inwards for muscle contraction shortening of the muscle is known as muscle contraction lengthening of the muscle is known as muscle relaxation. 3 What skeletal muscle lengths generated passive force? (Provide a range.) Your answer: 80-100 mm muscle lengths generated passive force. 4 If you were curling a 7-kg dumbbell, when would your bicep muscles be contracting isometrically? Your answer: bicep muscles remain at fixed length. 5

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PhysioEx Exercise 2 Activity 6

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