Answered: 6. During the cross-bridge cycle, ATP…

6. During the cross-bridge cycle, ATP binding to myosin causes the myosin head to detach from actin

1st Edition

ISBN:9781938168130

Author:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Publisher:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Chapter10: Muscle Tissue

Section: Chapter Questions

Problem 9RQ: In relaxed muscle, the myosin-binding site on actin is blocked by ________. titin troponin myoglobin...

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Concept explainers

Tissue regeneration & repair

Tissue regeneration involves the restoration of tissue components by regrowth of damaged tissues. In contrast, tissue repair involves patching of injured tissue rather than restoring it. It is the proliferative capacity of the cells that decides the amount of regeneration against the repair that would occur in the tissue. Both regeneration and repair depending on the duration of the injury and response to the inflammation.

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6. During the cross-bridge cycle, ATP binding to myosin causes the myosin head to detach from actin

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The release of calcium ions initiates muscle contractions. Watch this video (http://openstaxcollege.org/l/calciumrole) to learn more about the role of calcium. (a) What are â€œT-tubulesâ€� and what is their role? (b) Please also describe how actin-binding sites are made available for cross-bridging with myosin heads during contraction.
Which of the following properties is not common to all three muscle tissues? excitability the need for ATP at rest, uses shielding proteins to cover actin binding sites elasticity
Watch this video (http://openstaxcollege.org/l/micromacro) to learn more about macro- and microstructures of skeletal muscles. (a) What are the names of the junction points between sarcomeres? (b) What are the names of the subunits within the myofibrils that run the length of skeletal muscle fibers? (c) What is the â€œdouble strand of pearlsâ€� described in the video? (d) What gives a skeletal muscle fiber its striated appearance?
The correct order for the smallest to the largest unit of organization in muscle tissue is ________. fascicle, filament, muscle fiber, myofibril filament, myofibril, muscle fiber, fascicle muscle fiber, fascicle, filament, myofibril myofibril, muscle fiber, filament, fascicle
In relaxed muscle, the myosin-binding site on actin is blocked by ________. titin troponin myoglobin tropomyosin
9. The binding of the myosin head to the free binding site of the actin filament results in the contraction of the muscle. Which of the following will NOT result in the attachment of the myosin head to the actin filament? ○ High-energy configuration of the myosin head Binding of calcium ions to the protein complex in the actin filament Binding of ATP to myosin head Hydrolysis of bound ATP to the myosin head
62.
51.
3.4. About human skeletal muscle contraction, what are the correct statements? PHYSIOLOGY_basic (OJO) A muscle fiber is made by the parallel apposition of sarcomers. Generation of force relies on the formation of cross-bridges between actin and myosin filaments. In the process of contraction, adenosine triphosphate (ATP) is required both to drive the actin-myosin association-dissociation cycle and to recycle calcium back to the endoplasmic reticulum. Each muscle fiber is innervated by one neuron only. T tubules are plasma membrane invaginations of the sarcolemma that allow excitation-contraction coupling.
11. Arrange the following in statements in the order that they occur, by adding a number: nf.e ACh is released into the synaptic cleft The action potential, carried deep into the cell, causes the sarcoplasmic reticulum to release calcium ions The muscle cell relaxes and lengthens ACh diffuses across the synaptic cleft and binds to receptors on the plasma membrane of the muscle cell The calcium ion concentration at the myofilaments increases, the myofilaments slide past one another, and the cell shortens Depolarization occurs, and an action potential is generated As calcium is actively reabsorbed into the sarcoplasmic reticulum, its concentration at the myofilaments decreases
1. Draw and label the steps of the sliding filament mechanism in skeletal muscle. This should be four parts (Cross- bridge, power stroke, disassociation, reactivation). On each part, be sure to include the following structures: actin, myosin, troponin, tropomyosin. Also include ATP, myosin ATPase, ADP, Pi, and H* (where important). • Cross-bridge: . Powerstroke: ● Disassociation: ● Reactivation:
17. Which of the following choices is CORRECT? A Myofibrils extend the length of a muscle fibre B. sarcomeres in series make up the length of a myofibnil C. The M-line is part of the cytoskeleton that anchors the myosin filaments, stabilizing the sarcomere D. The ends of the actin filaments are anchored to the Z-line or disk E All of the above F. Both C and D