BIOLOGY-TEXT
5th Edition
ISBN: 9781260169621
Author: BROOKER
Publisher: MCG
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Chapter 45, Problem 3CQ
Summary Introduction
To determine: The role of energy with regard to the mechanism by which skeletal muscle cells contract.
Introduction:
Actin and myosin interact to promote muscle contraction and shortening. Myosin proteins associate in a parallel way with the extension of hinges and heads on the sides to form cross-bridges.
Cross-bridge cycle during muscle contraction involves the following sequence of events:
- Binding of a cross-bridge to a thin filament.
- Movement of cross-bridge towards the H zone of the sarcomere.
- Detachment of the cross-bridge from the actin filament.
- Movement of cross-bridge away from the H zone for the cycle to begin again.
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Chapter 45 Solutions
BIOLOGY-TEXT
Ch. 45.1 - Prob. 1CCCh. 45.2 - Prob. 1CCCh. 45.2 - Prob. 1CSCh. 45.2 - Prob. 2CSCh. 45.3 - What is the normal function of the PPAR- protein...Ch. 45.3 - CoreSKILL What was the hypothesis proposed by...Ch. 45.3 - CoreSKILL Assume that the mean weight of both...Ch. 45 - Prob. 1TYCh. 45 - Prob. 2TYCh. 45 - Prob. 3TY
Ch. 45 - Prob. 4TYCh. 45 - The function of ATP during muscle contraction is...Ch. 45 - The function of Ca2+ in skeletal muscle...Ch. 45 - Stimulation of a muscle fiber by a motor neuron...Ch. 45 - Muscle fibers that have a large number of...Ch. 45 - Which of the following statements about movement...Ch. 45 - Prob. 10TYCh. 45 - Compare the structural and functional features of...Ch. 45 - Describe as many types of animal locomotion as you...Ch. 45 - Prob. 3CQCh. 45 - List and briefly describe the steps in the...Ch. 45 - Discuss the three types of muscle tissues found in...
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- Discuss the specific role of ATP in muscle contraction.arrow_forwardDescribe the contraction of a muscle fiber, starting with what events take place at the neuromuscular junction, explaining how depolarization along the length of the sarcolemma occurs, the role of calcium (where it is released, what it binds to, etc.), and the events that occur after calcium binds to troponin. Draw a few simple, labelled diagrams of a neuromuscular junction and sarcomere and outline the steps of excitation-contraction coupling, including power stroke, recovery stroke, formation of cross bridges, role of ATP, etc.arrow_forward(1) The reading for today (Lieber and Ward, 2011) and your textbook describe the length-tension relationship of muscle, which can be explained by the figure below. Describe physiologically what is happening to explain the length-tension relationship, as shown by this figure. (a) 120 maximum tension (%) 100 80 60- 40 20 0 1.0 1.5 2.0 active (3) passive 2.5 3.0 3.5 4.0 length (um)arrow_forward
- Explain the role of ATP in muscle contraction and muscle relaxation.arrow_forwardIllustrate and describe the fine structure (electron micrograph) of a skeletal muscle fiber.arrow_forwardSkeletal muscle is described as striated. What are the lighter, thinner stripes noted under the microscope? Group of answer choices troponin actin myosin dystrophin Rather than innervating individual muscle fibers, motor neurons often innervate two or more muscle fibers. The motor neuron and the muscle fibers it innervates are together called a: Group of answer choices motor unit myofibril muscle fascicle motor fascia Fast glycolytic muscle fibers allow for relatively quick ATP energy production by splitting glucose (but eventually leads to fatigue), a process described as: Group of answer choices fermentation aerobic pathway anaerobic pathway ATP reserve usearrow_forward
- Discuss the metabolic pathways of ATP production in skeletal muscle in terms of timing, mechanism, and function.arrow_forwardOutline the molecular mechanism for skeletal muscle contraction. At what point is ATP used and why?arrow_forwardExplain the sliding filament mechanism of muscle contraction, including the role of titin. Describe the innervation of skeletal muscle fibers at neuromuscular junctions. Define a motor unit. Compare and contrast the three kinds of skeletal muscle fibers.arrow_forward
- Explain differences in mitochondria for the three types of muscle fiber: slow twitch, fast twitch oxidative and fast twitch glycolytic?arrow_forwardThank youarrow_forwardShortly after a person dies, Calcium ions diffuse out of the sarcoplasmic reticulum and the body becomes very stiff and rigid, a phenomenon called rigor mortis (stiffness + death). Given ATP’s role in myosin head movement, propose an explanation for rigor mortis.arrow_forward
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