Human Biology Custom Edition
11th Edition
ISBN: 9781337631532
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
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Textbook Question
Chapter 6, Problem 4SQ
The _____ is the basic unit of muscle contraction.
- a. myofibril
- b. sarcomere
- c. muscle fiber
- d. myosin filament
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In relaxed muscle, the myosin-binding site on actin is blocked by ________. a. titin b. troponin c. myoglobin d. tropomyosin
Chapter 6 Solutions
Human Biology Custom Edition
Ch. 6 - In a general sense, how do skeletal muscles...Ch. 6 - In the diagram below, label the fine structure of...Ch. 6 - How do actin and myosin interact in a sarcomere to...Ch. 6 - How does a muscle fiber incur an oxygen debt?Ch. 6 - What is the function of the sarcoplasmic reticulum...Ch. 6 - Explain why (a) calcium ions and (b) ACh are vital...Ch. 6 - What is a motor unit? Why does a rapid series of...Ch. 6 - What are the structural and functional differences...Ch. 6 - Prob. 1SQCh. 6 - Prob. 2SQ
Ch. 6 - Prob. 3SQCh. 6 - The _____ is the basic unit of muscle contraction....Ch. 6 - Skeletal muscle contraction requires _________. a....Ch. 6 - Nerve impulses first stimulate a skeletal muscle...Ch. 6 - Prob. 7SQCh. 6 - Prob. 8SQCh. 6 - Prob. 9SQCh. 6 - Prob. 10SQCh. 6 - You are training athletes for the 100-meter dash....Ch. 6 - Prob. 2CTCh. 6 - Prob. 3CTCh. 6 - At the gym Sean gets on a stair-climbing machine...
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- Which of the following is the site of calcium ion storage within muscles? a. T tubules b. sarcoplasmic reticulum c. actin filaments d. myosin filamentsarrow_forwardThe 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. myosin myosin C. actin actin D. actin myosinarrow_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
- The actual contractile units of muscle, called _____, extend from middle of one _____ to middle of next along length of myofibrils. A. T tubule, M line B. sarcoplasmic reticulum, H zone C. sarcomeres, I band D. sarcolemma, A bandarrow_forwardWhat structure in skeletal muscle cells functions in calcium storage? a.myofibrillar network b.sarcoplasmic reticulum c.intermediate filament network d.mitochondriaarrow_forwardDuring muscle contraction, calicum ions bind to A. Actin Filaments B. Tropomyosin C. Troponin D. Myosin Filamentsarrow_forward
- Which 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 sentences is NOT correct? A. White fibers make up fast-twitch muscle B. Muscle spindle is a type of receptor that detects muscle length C. Exocrine gland secretes its product directly into the bloodstream D. When an action potential is generated within a motor neuron, every muscle cell of the motor unit is stimulated to contractarrow_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
- 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_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_forwardDuring a concentric contraction of a skeletal muscle fiber, myofibrils a. lengthen. b. remain the same length. c. increase in diameter. d. shorten.arrow_forward
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