Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Textbook Question
Chapter 45, Problem 5TY
The function of ATP during muscle contraction is to
- a. cause an allosteric change in myosin so it detaches from actin.
- b. provide the energy necessary for the movement of the cross-bridge.
- c. expose the myosin-binding sites on the thin filaments.
- d. do all of the above.
- e. do a and b only.
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The function of ATP during muscle contraction is toa. cause an allosteric change in myosin so it detaches from actin.b. provide the energy necessary for the movement of the cross-bridge.c. expose the myosin-binding sites on the thin filaments.d. do all of the above.e. do a and b only.
The function of Ca2+ in skeletal muscle contraction is toa. cause an allosteric change in myosin so it detaches from actin.b. provide the energy necessary for the movement of the cross-bridge.c. expose the myosin-binding sites on the thin filaments.d. bind to tropomyosin.e. do a and c only.
The functions of tropomyosin in skeletal muscle include
A. releasing calcium ions after initiation of contraction.
B. generating ATP which it passes to the contractile mechanism.
C. binding to myosin during contraction.
D. acting as a relaxing protein at rest by covering up the sites where myosin binds to actin.
E. sliding on actin to produce shortening.
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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- 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 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_forwardWhich of the following are involved interaction of myosin and actin? A. interaction between the myosin head and the myosin binding site on actin B. requires troponin to go through a conformational change pulling topomyosin from its resting position C. all of the above D. occurs when topomyosin is pulled away from the myosin binding site on actinarrow_forward
- Rigor mortis occurs following death because a. tropomyosin remains over the myosin binding sites of actin. b. myosin heads attach to actin and are not released due to lack of ATP. c. the myosin becomes misshapen. d. all of the Ca2+ remains within the sarcoplasmic reticulum.arrow_forwardIn muscle cells, myosin molecules continue moving along actin molecules as long as: A. ATP is present and intracellular Ca2+ is high. B. ADP is present and intracellular acetylcholine is high. C. ATP is present and troponin is not bound to Ca2+. D.ATP is present and intracellular Ca2+ is low. E. ADP is present and tropomyosin is released from intracellular stores. QUESTION 27 Lamellipodia and filopodia frequently occur near the edges of cells. These membrane features: A. are supported by intermediate filaments, such as keratin. B. result from the polymerization of actin filaments. C. result from the contraction of actin-myosin. D. probably do not serve any useful purpose to the cell. E. are directly linked to the microtubule organizing center. QUESTION 28 Sort the following events to reflect the sequence during smooth muscle contraction upon delivery of muscle stimu 3. Activation of the myosin light-chain kinase 5. Interaction of myosin head with actin 4. Phosphorylation of myosin 1.…arrow_forwardWhen a skeletal muscle fiber undergoes a concentric isotonic contraction,a. M lines remain the same distance apart.b. Z lines move closer to the ends of the A bands.c. A bands become shorter.d. I bands become wider.e. M lines move closer to the end of the A band.arrow_forward
- Put the following skeletal muscle contraction events in the order that they occur: a. The myosin head swivels toward the center of the sarcomere. b. Calcium ions are released from the sarcoplasmic reticulum and bind to troponin. c. An action potential is propagated along the sarcolemma and transverse tubules. d. Myosin binds to actin, forming crossbridges. e. Myosin heads bind ATP molecules and release from actin. f. Tropomyosin molecules are moved off active sites on actin. g. ATPase splits ATP, providing the energy to reset the myosin head.arrow_forwardWhen sarcomeres contract during muscle contraction, which of the following occurs? A. The myosin filaments lengthen. B. The myosin filaments "walk" along the actin microfilaments. C. The myosin filaments shorten. D. The actin filaments shorten.arrow_forwardContraction 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? Row Component of muscle fibre Component of muscle fibre A. Ca2+ myosin B. troponin myosin C. troponin tropomyosin D. actin Ca2+arrow_forward
- As ADP and Ⓟ are released from a myosin head,a. actin filaments move toward the H band.b. a sarcomere shortens.c. myosin filaments pull toward the thin filaments.d. All of these are correct.arrow_forwardWhen ADP and Pi are bound to myosin in the cross-bridge cycle... (MULTIPLE SELECT) A. There is no force production and myosin is not bound to actin B. There is no force production and myosin is bound to actin C. There is force production and myosin is not bound to actin D. If its smooth muscle, a second phosphate might be bound to the light chain E. The cross-bridge is in a state of rigor mortis F. There is force production and myosin is bound to actinarrow_forwardThe binding of calcium to troponin will directly cause A. the hydrolysis of ATP B. the binding of ATP to myosin C. the further release of calcium into the cytoplasm D. the movement of tropomyosin, thereby exposing the myosin-binding site on the actin molecule E. the movement of tropomyosin, thereby exposing the actin-binding site on the myosin molecule F. release of neurotransmitters from the axon terminals G. Both B and Farrow_forward
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