BIOLOGY: ESSENTIALS >LL< W/ CONNECT
3rd Edition
ISBN: 9781260635379
Author: Hoefnagels
Publisher: MCG
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Chapter 26, Problem 8MCQ
Summary Introduction
Introduction:
The muscles are those fibrous tissues which result in locomotion after getting involved in the process of contraction (muscle contraction). The protein filaments, known as myosin and actin, transform into the muscles.
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Which 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.
What do skeletal muscle contractions share in common with smooth muscle contractions?a. Both types of contractions do not require calcium ions for a contraction to occur.b. Both types of contractions generate little force or a weak force.c. Both types of contractions consume very little ATP.d. Both types of contractions result from thick and thin filaments sliding past one another.
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 26 Solutions
BIOLOGY: ESSENTIALS >LL< W/ CONNECT
Ch. 26.1 - How do the skeletal and muscular systems interact?Ch. 26.1 - Prob. 2MCCh. 26.1 - Prob. 3MCCh. 26.2 - Prob. 1MCCh. 26.2 - Prob. 2MCCh. 26.3 - Prob. 1MCCh. 26.3 - Prob. 2MCCh. 26.3 - Prob. 3MCCh. 26.3 - Prob. 4MCCh. 26.3 - Prob. 5MC
Ch. 26.4 - Prob. 1MCCh. 26.4 - Prob. 2MCCh. 26.4 - Prob. 3MCCh. 26.4 - Prob. 4MCCh. 26.4 - Prob. 5MCCh. 26.5 - Prob. 1MCCh. 26.5 - What happens when a muscle cell can not generate...Ch. 26.6 - Prob. 1MCCh. 26.6 - Prob. 2MCCh. 26 - Prob. 1MCQCh. 26 - Prob. 2MCQCh. 26 - Prob. 3MCQCh. 26 - Prob. 4MCQCh. 26 - Prob. 5MCQCh. 26 - Prob. 6MCQCh. 26 - Prob. 7MCQCh. 26 - Prob. 8MCQCh. 26 - Prob. 9MCQCh. 26 - Distinguish among a hydrostatic skeleton, an...Ch. 26 - Explain the observation that animals with...Ch. 26 - Prob. 3WIOCh. 26 - Prob. 4WIOCh. 26 - Prob. 5WIOCh. 26 - Prob. 6WIOCh. 26 - Prob. 7WIOCh. 26 - Prob. 8WIOCh. 26 - Prob. 9WIOCh. 26 - How might your muscles lengthen when you stretch?...Ch. 26 - How do the effects of exercise or lack thereof...Ch. 26 - Prob. 12WIOCh. 26 - Search the Internet for disorders of the skeletal...Ch. 26 - What is role of calcium in bones? In muscle...Ch. 26 - The following table shows recent mens world-record...Ch. 26 - Prob. 1SLCh. 26 - Prob. 1PITCh. 26 - Prob. 2PITCh. 26 - Prob. 3PITCh. 26 - Prob. 4PIT
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- 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_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_forwardThe 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.arrow_forward
- The sliding filament mechanism describes the process during which: a. actin and myosin slide relative to each other b. sarcomeres slide relative to each other c. troponin and tropomyosin slide relative to each other d. muscle fibers slide past each otherarrow_forwardWhen 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_forwardWhat is the role of ATP in muscle function? a. ATP provides energy that enables myosin to form cross bridges with actin. b. ATP enables myosin to detach from actin. c. ATP provides energy to transport calcium back into storage. d. all of the abovearrow_forward
- 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? Row Component of muscle fibre Component of muscle fibre A. Ca2+ myosin B. troponin myosin C. troponin tropomyosin D. actin Ca2+arrow_forwardThe 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.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_forward
- the troponin/tropomyosin complex will inhibit the crossbridges of myosin from with actin. this is true during: A. Muscle relaxation B. Muscle contraction C. Nerve stimulation D. Both a & barrow_forwardWhich of the following is true? A. Muscle fibers either will contract with all the force possible under existing conditions or will not contract at all. B. Skeletal muscles can contract with varying degrees of strength given different circumstances. C. Muscle length does not have an effect on contractile strength. D. Metabolic condition of the myocyte does not have an effect on contractile strength.arrow_forwardWhich of the following changes takes place when a skeletal muscle contracts?A. Z discs move farther apart.B. Actin filaments contract.C. Myosin filaments contract.D. Sarcomeres become shorter.arrow_forward
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