What is the fundamental contractile unit of skeletal muscle? b. What are the names of the bands, lines and zone of the contractile unit of skeletal muscle? c. Each of the contractile unit region names in (b) contains a letter. What does each of these letters stand for? d. What changes occur in the contractile unit regions during contraction?

What is the fundamental contractile unit of skeletal muscle? b. What are the names of the bands, lines and zone of the contractile unit of skeletal muscle? c. Each of the contractile unit region names in (b) contains a letter. What does each of these letters stand for? d. What changes occur in the contractile unit regions during contraction?

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter8: Muscle Physiology

Section: Chapter Questions

Problem 16UC

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Similar questions

The structural organization of muscle fibers makes it possible to produce contractile force. a. What is the fundamental contractile unit of skeletal muscle? b. What are the names of the bands, lines and zone of the contractile unit of skeletal muscle? c. Each of the contractile unit region names in (b) contains a letter. What does each of these letters stand for? d. What changes occur in the contractile unit regions during contraction?
a) Describe how the isolated muscle behaved as it was stretched progressively. b) What effect does stretching the muscle have on contraction strength? Is this effect linear? c) What stretch resulted in the highest contraction force? What happens to the muscle at the highest stretch levels?
Cardiac and skeletal muscle are both “striated” types of muscle and yet they have very distinct functional characteristics. a) Skeletal muscle functions as discrete motor units and the cardiac muscle works as a functional syncytium. Define the italicized terms in the previous sentence, explain their importance, and describe the cellular features that underlie these functional differences. b) Cardiac muscle exhibits automaticity, while excitation of skeletal muscle is neurogenic. Define the italicized terms and provide a brief explanation of mechanisms underlying each.
In muscle cells, magnesium ions compete with calcium ions for binding sites on troponin molecules. If a person has too high a concentration of magnesium ions in the blood, magnesium ions can prevent calcium ions from binding troponin. A) What effect would this have on muscle contraction (strengthen, weaken, or no effect)? B) Use your knowledge of how muscle fibers contract to explain your answer in part A.
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Describe a typical smooth muscle cell. How do itsstructure and its contraction process differ from those ofskeletal muscle fibers?
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