What are the positions of actin and myosin molecules in the sarcomere before and during the...
What are the positions of actin and myosin molecules in the sarcomere before and during the muscle contraction?
Homework Answers
Schematically actin filaments attached perpendicularly to both sarcomere extremities (longitudinal sides) make contact with myosin filaments positioned in the middle of the sarcomere and in parallel to the actin filaments.
Before the contraction the sarcomeres are extended (relaxed) since the contact between actin and myosin filaments is only made by their extremities. During contraction actin filaments slide along the myosin filaments and the sarcomeres shorten
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What are the positions of actin and myosin molecules in the
sarcomere before and during the...
Muscle contraction: Select one O a occurs when myosin pulls on actin and the sarcomere shortens...
Muscle contraction: Select one O a occurs when myosin pulls on actin and the sarcomere shortens b. occurs when actin pushes on myosin and the sarcomere elongates O c occurs when the myosin tail splits the actin filament in half Od occurs when actin and myosin entangle, generating more distance between Z lines
1. Describe the structure of a muscle, including the following terms: myosin, actin, sarcomere, myofibril, fiber,...
1. Describe the structure of a muscle, including the following terms: myosin, actin, sarcomere, myofibril, fiber, bundle.
2. Muscle contraction involves the "pulling" of actin filaments by myosin II heads of a bipolar...
2. Muscle contraction involves the "pulling" of actin filaments by myosin II heads of a bipolar filament in sarcomeres. Would it be possible for myosin II heads to induce muscle relaxation (sarcomere lengthening) instead? Why or why not? (12.5 points) ANSWER:
As actin and myosin filaments slide past each other during muscle contraction. actin filaments shorten, while...
As actin and myosin filaments slide past each other during muscle contraction. actin filaments shorten, while myosin filaments do not myosin filaments shorten, while actin filaments do not both actin and myosin filaments shorten neither actin nor myosin filaments shorten The Ca^2+ required for skeletal muscle contraction is released from the sarcoplasmic reticulum. enters the cell due to the opening of voltage regulated Ca^2+ channels from the T tubules. is actively transported into the cell. is released from mitochondria Myocardial...
As actin and myosin filaments slide past each other during muscle contraction, i. actin filaments shorten,...
As actin and myosin filaments slide past each other during muscle contraction, i. actin filaments shorten, while myosin filaments do not ii. myosin filaments shorten, while actin filaments do not iii. both actin and myosin filaments shorten iv. neither actin nor myosin filaments shorten The Ca^2+ required for skeletal muscle contraction i. is released from the sarcoplasmic reticulum. ii. enters the cell due to the opening of voltage regulated Ca^2+ channels from the T tubules. iii. is actively transported into...
76) G-Actin polymerizes to form F-Actin. 77) Thin filaments are composed exclusively of the protein Myosin....
76) G-Actin polymerizes to form F-Actin. 77) Thin filaments are composed exclusively of the protein Myosin. 78) Each thin filament consists of about 250 Myosin molecules 79) The power stroke is generated during the latent phase. 80) Reformation of cross bridges occurs during the contraction-relaxation phase. 81) Creatine phosphate (phosphocreatine) carries extra oxygen in slow oxidative fibers 82) Myosin gives fast oxidative fibers their characteristic color.
Question 68 What is the sarcomere Provides energy for muscular contraction It acts to allow the...
Question 68 What is the sarcomere Provides energy for muscular contraction It acts to allow the actin heads to attach to myosin The functional unit of muscular contraction The thin filament
Part B-Steps in a Cross Bridge Cycle The sarcomere shortens when the myosin heads of the...
Part B-Steps in a Cross Bridge Cycle The sarcomere shortens when the myosin heads of the thick flaments, in a cocked position, form cross bridges with the actin molecules in thin filaments. This activity will test your understanding of the steps that oocur in one complete cross bridge cycle. Place the steps that occur during a single cross bridge cycle in the correct order from left to right. View Available Hint(s) Reset Help ATP is hydrolyzed to ADP and P...
Question 28 4 pts Once the action potential occurs in the sarcolemma, it spreads moving down...
Question 28 4 pts Once the action potential occurs in the sarcolemma, it spreads moving down the T-tubules. What next? What is the correct order of events which result in skeletal muscle contraction? (4 points) a. Once the muscle cell action potential is initiated then calcium ions are released from the sarcoplasmic reticulum. These calcium ions bind to troponin. With this binding, tropomyosin is pulled away from the active sites on actin. Myosin can bind with actin forming a cross...
30. What protein based, muscular structure is NOT an essential component of the thin filaments of a sarcomere as per the...
30. What protein based, muscular structure is NOT an essential component of the thin filaments of a sarcomere as per the sliding filament theory model of contraction? a. Actin c. Troponin b. Myosin d. Tropomyosin 31. Skeletal muscle’s inherent ability to contract and stretch while still continuing to return to its original length is known as: a. Extensibility c. Contractility b. Elasticity d. Excitability 32. Which of the following is NOT a muscle of the lower appendicular muscle system? a....
Muscle contraction: Select one O a occurs when myosin pulls on actin and the sarcomere shortens b. occurs when actin pushes on myosin and the sarcomere elongates O c occurs when the myosin tail splits the actin filament in half Od occurs when actin and myosin entangle, generating more distance between Z lines
2. Muscle contraction involves the "pulling" of actin filaments by myosin II heads of a bipolar filament in sarcomeres. Would it be possible for myosin II heads to induce muscle relaxation (sarcomere lengthening) instead? Why or why not? (12.5 points) ANSWER:
As actin and myosin filaments slide past each other during muscle contraction. actin filaments shorten, while myosin filaments do not myosin filaments shorten, while actin filaments do not both actin and myosin filaments shorten neither actin nor myosin filaments shorten The Ca^2+ required for skeletal muscle contraction is released from the sarcoplasmic reticulum. enters the cell due to the opening of voltage regulated Ca^2+ channels from the T tubules. is actively transported into the cell. is released from mitochondria Myocardial...
As actin and myosin filaments slide past each other during muscle contraction, i. actin filaments shorten, while myosin filaments do not ii. myosin filaments shorten, while actin filaments do not iii. both actin and myosin filaments shorten iv. neither actin nor myosin filaments shorten The Ca^2+ required for skeletal muscle contraction i. is released from the sarcoplasmic reticulum. ii. enters the cell due to the opening of voltage regulated Ca^2+ channels from the T tubules. iii. is actively transported into...
76) G-Actin polymerizes to form F-Actin. 77) Thin filaments are composed exclusively of the protein Myosin. 78) Each thin filament consists of about 250 Myosin molecules 79) The power stroke is generated during the latent phase. 80) Reformation of cross bridges occurs during the contraction-relaxation phase. 81) Creatine phosphate (phosphocreatine) carries extra oxygen in slow oxidative fibers 82) Myosin gives fast oxidative fibers their characteristic color.
Question 68 What is the sarcomere Provides energy for muscular contraction It acts to allow the actin heads to attach to myosin The functional unit of muscular contraction The thin filament
Part B-Steps in a Cross Bridge Cycle The sarcomere shortens when the myosin heads of the thick flaments, in a cocked position, form cross bridges with the actin molecules in thin filaments. This activity will test your understanding of the steps that oocur in one complete cross bridge cycle. Place the steps that occur during a single cross bridge cycle in the correct order from left to right. View Available Hint(s) Reset Help ATP is hydrolyzed to ADP and P...
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