Human Biology (MindTap Course List)
11th Edition
ISBN: 9781305112100
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
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Chapter 6, Problem 8SQ
Summary Introduction
Introduction: During skeletal muscle contraction, a motor neuron stimulates the skeletal muscle fibers. The stimulation of skeletal muscle fibers ultimately causes the interaction between the myofilaments within the skeletal muscle fibers to produce a surface tension between the muscles. Two primary factors considered for initiating muscle contraction include resistance and the force generated by the muscle.
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In sustained, moderate exercise, skeletal muscle is predominantly using ______________ as its energy source. a. amino acids b. glucagon c. fatty acids d. creatine phosphate
The firmness of rigor mortis ___.
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will be removed by the application of heat to the muscles
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Muscle 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 reticulum
Chapter 6 Solutions
Human Biology (MindTap Course List)
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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- In relaxed muscle, the myosin-binding site on actin is blocked by ________. a. titin b. troponin c. myoglobin d. tropomyosinarrow_forwardThe names of the muscles can indicate all of the following, EXCEPT ___________. a.myofibril numbers of the muscle b.the direction of the muscle relative to the long axis of the body c.action of the muscle d.the region of the body where the muscle is located 2. An exocrine gland that loses small parts of its cell bodies during secretion, as is the case for the mammary gland, is further classified as a ____________ gland. a.Endocrine b.Merocrine c.Holocrine d.Apocrinearrow_forward. Injection of C. botulinum toxin (Botox)______ . a. causes irreversible muscle contraction b. stimulates formation of ATP from ADP c. prevents release of ACh by motor neurons d. blocks the actin binding site of myosinarrow_forward
- The condition rigor mortis develops several hours after death, it is characterized by muscular rigidity, it happens because a. Because of a lack of ATP b. Because actin can’t detach from the myosin head c. At death, calcium ions leak out of the SR and trigger a muscle contraction d. a, b and c e. Only a f. Only carrow_forwardMuscle that has a striped appearance is described as being a. elastic b. nonstriated c. excitable d. striatedarrow_forwardMuscle 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-oxidativearrow_forward
- During muscle contraction, calicum ions bind to A. Actin Filaments B. Tropomyosin C. Troponin D. Myosin Filamentsarrow_forwardMuscle contractions where the muscle shortens but tension remains constant are called A. isometric B. hypermetric C. hypotonic D. isotonic E. hypertonicarrow_forwardWhen the length of the muscle stays the same but the force increases during contraction it is referred to as an: A. Isotonic Contraction B. Isometric Contraction C. Isotreppid Contraction D. Isochronal Contractionarrow_forward
- The power stroke of muscle contraction occurs as the myosin head pivots toward its tail and the thin filament slides along the length of the thick filament. A. true B. falsearrow_forwardAponeuroses are extentions of connective tissue beyond muscle cells that attach the muscle to bone. A. True B. Falsearrow_forward28. The pairs of skeletal muscles are the prime mover and antagonist. A. True B. False ____ 29. Injury to the muscle tendon in front of the tibia is A. rotator cuff injury. B. shin splints. C. muscle atrophy. ____ 30. What is the lubricating substance that is secreted to reduce the friction of joint movement? A. amphiarthoses B. synovial fluid C. bursaearrow_forward
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