Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Textbook Question
Chapter 45, Problem 8TY
Muscle fibers that have a large number of mitochondria, contain large amounts of myoglobin, and exhibit low rates of ATPase activity are called ______blank fibers.
- a. slow-glycolytic
- b. fast-glycolytic
- c. intermediate
- d. fast-oxidative
- e. slow-oxidative
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Muscle fibers that have a high number of mitochondria, contain largeamounts of myoglobin, and exhibit low rates of ATP hydrolysis arecalled __________ fibers.a. slow-glycolyticb. fast-glycolyticc. intermediated. fast-oxidativee. slow-oxidative
The mechanism of muscle contraction is best explained by the sliding filament model. According to this model, thin ___i___ filaments slide over thick ___ii___ filaments.The statement given above is completed by information in row
Row
i
ii
A.
myosin
actin
B.
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myosin
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actin
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actin
myosin
Contraction of muscles requires binding of various components of muscle fiber. Which of the following rows correctly matches two components of muscle fibre that bind with each other?
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Component of muscle fibre
Component of muscle fibre
A.
Ca2+
myosin
B.
troponin
myosin
C.
troponin
tropomyosin
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actin
Ca2+
Chapter 45 Solutions
Biology
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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- In relaxed muscle, the myosin-binding site on actin is blocked by ________. a. titin b. troponin c. myoglobin d. tropomyosinarrow_forwardWhen a muscle fiber is stretched from 60% of its optimal length to Lo, what change or changes are happening on the cellular level (MULTIPLE SELECT)? A. Increased calcium release from the SR B. Increased firing of action potentials from the alpha motor neuron C. Increased rate of myosin ATPase activity D. Increased number of actin-myosin bridges E. Increased stretch on titin, producing more passive forcearrow_forwardWhich of the following statements best describes the sliding filament mechanism of muscle contraction? a. Actin and myosin filaments do not shorten, but rather, slide past each other. b. Actin and myosin filaments shorten and slide past each other. c. As they slide past each other, actin filaments shorten, but myosin filaments do not shorten. d. As they slide past each other, myosin filaments shorten, but actin filaments do not shorten.arrow_forward
- At low intracellular Ca2+ concentration, _________________ the active sites on the thin actin filament. a. troponin blocks b. troponin exposes c. tropomyosin blocks d. tropomyosin exposes e. a and carrow_forwardDuring muscle contraction, calicum ions bind to A. Actin Filaments B. Tropomyosin C. Troponin D. Myosin Filamentsarrow_forwardConsidering the Types of Skeletal Muscle Fibers, people that are naturally strong weight-Lifters are probably born with a higher percentage of Whereas a person that is naturally good at long-distance running, would probably be born with a higher percentage of, 31. olim A. Fast-twitch/white fibers : Slow-twitch/dark or red fibers B. Slow-twitch/dark or red fibers : Fast-twitch/white fibers C. Intermediate/green fibers : Tertiary Intermediate/purple fibers D. Tertiary Intermediate/purple fibers : Intermediate/green fibers 36 Seonbed is:arrow_forward
- Muscle contractions where the muscle shortens but tension remains constant are called A. isometric B. hypermetric C. hypotonic D. isotonic E. hypertonicarrow_forwardMuscle contraction is the result of critical steps characterized by conformational changes to protein structures in the supramolecule. Which of the following conformational changes requires energy, i.e. ATP hydrolysis? A. Binding of calcium to tropomyosin changing its conformation and exposing a binding site in troponin B. Binding of myosin to troponin resulting in the power stroke and cross-bridge cycle of muscle contraction. C. Disruption in the binding of the myosin head to troponin preceding its release and relaxation back to its activated form. D. Binding of ATP to the myosin head bound to troponin.arrow_forwardMuscle relaxation occurs when ________. a. calcium ions are actively transported out of the sarcoplasmic reticulum b. calcium ions diffuse out of the sarcoplasmic reticulum c. calcium ions are actively transported into the sarcoplasmic reticulum d. calcium ions diffuse into the sarcoplasmic reticulumarrow_forward
- When a skeletal muscle cell contracts and the muscle shortens, a. the position of an actin molecule relative to a myosin molecule does not change. b. myosin heads generate a single power stroke. c. the actin ATPase allows the actin molecule to swivel. d. the actin molecule swivels during the power stroke e. some myosin heads are forming crossbridges as others are releasing them.arrow_forwardWhich of the following statements about the microscopic structure of smooth muscle fibers is incorrect? a. smooth muscle cells lack myofibrils, sarcomere, and t-tubules b. smooth muscle cells contain endomysium only c. smooth muscles cells contain caveolae that sequesters calcium ions d. all of the above e. none of the abovearrow_forwardThe energy for muscle contraction is most directly obtained from a.phosphocreatine. b.ATP. c.anaerobic respiration. d.aerobic respiration.arrow_forward
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