Z331 Fall 2010 Ecampus Week 7 Muscle Fiber Types Posted

Z331 Fall 2010 Ecampus Week 7 Muscle Fiber Types Posted -...

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Week 7: Lecture 1: Chapter 10 –   Muscular Tissue: Muscle Fiber Types
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3 Types of Skeletal Muscle Fibers 1. Slow fibers 2. Fast fibers 3. Intermediate fibers Table 10–3, 313
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(Intermediate) Marieb, 6 th ed
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Slow Fibers (Oxidative) Are slow to contract, slow to fatigue Have small diameter, more mitochondria Have high blood supply Contain myoglobin Red muscle Figure 10–21, p 314
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Fast Fibers (Glycolytic) Contract very quickly  Have large diameter, large glycogen reserves, few  mitochondria Have strong contractions, fatigue quickly White muscle Figure 10–21, p 314
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Intermediate Fibers (Fast oxidative) Are mid-sized Have low myoglobin Have more capillaries than fast fiber, slower to  fatigue Tortora, 10 th  ed. 
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Human muscles are mixed fiber  types Muscles are pink Percentages genetically determined Can change some percentages of fiber 
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Unformatted text preview: types with training = transformation http://www.wwu.edu/depts/healthyliving/PE511info/sarcopenia/sarcopenia%20website/causes_&_risk.htm What is the effect of physical conditioning? • Improves both power and endurance • Muscle Hypertrophy – Occurs in muscle that have been repeatedly stimulated to maximal tension – increases diameter of muscle fibers – increases number of myofibrils, myofilaments – increases mitochondria, glycogen reserves • Transformation of fiber types – Depending on exercise, convert fibers into slow or fast Muscle Atrophy • Lack of muscle activity: – reduces muscle size, tone, and power – Can be due to inactivity, loss of innervation, blood supply, disease, paralysis http://polioclinic.com/history/atrophy.htm http://www.medscape.com/viewarticle/466330...
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This note was uploaded on 02/15/2011 for the course ZOOLOGY 331 taught by Professor Amyharwell during the Fall '10 term at Oregon State.

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Z331 Fall 2010 Ecampus Week 7 Muscle Fiber Types Posted -...

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