7.3 - UNIT 7 Muscles and Muscle Tissue (Chapter 9) Skeletal...

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UNIT 7 Muscles and Muscle Tissue (Chapter 9) Skeletal Muscle Physiology II Effects of Exercise on Muscle Muscle Disorders (7th edition)
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Types of Skeletal Muscle Fibers skeletal muscle fibers are categorized according to: how they manufacture energy (ATP) - aerobic vs. anaerobic how quickly they contract skeletal muscle fibers are divided into three classes (table 9.2): SLOW OXIDATIVE fibers FAST GLYCOLYTIC fibers FAST OXIDATIVE fibers (7th edition)
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slow oxidative fibers dark red color due to abundant myoglobin obtain energy from aerobic metabolic reactions (oxygen dependent) contain a large number of mitochondria rich supply of capillaries contract slowly and resistant to fatigue Chicken drumsticks and thighs are abundant in these types of fibers, and are thus red in color (7th edition) http://www.flickr.com/photos/hand-nor-glove/307414766/
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fast glycolytic fibers contain little myoglobin ( white in color) and few mitochondria about twice the diameter of slow- oxidative fibers contain more myofilaments and generate more power depend on anaerobic pathways (not oxygen dependent) contract rapidly and tire quickly Chicken breasts are abundant in these types of fibers, and are thus white in color (7th edition) http://www.flickr.com/photos/brownpau/168579463/
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fast oxidative fibers have an intermediate diameter contract quickly like fast glycolytic fibers are oxygen-dependent (aerobic) have high myoglobin content ( red color) and rich supply of capillaries somewhat fatigue-resistant more powerful than slow oxidative fibers *skeletal muscles typically have all 3 types of fibers, but vary in the amount of each fiber; athletes can actually alter the composition of their muscles based on the activities that they do; for example, marathon runners develop their slow oxidative fibers, whereas weight lifters develop their fast glycolytic fibers. (7th edition)
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Muscle Metabolism immediate energy - used in first 10-30 seconds of vigorous exercise; ATP creatine phosphate (ATP-CP) system used; creatine phosphate contributes a phosphate to ADP to make ATP; 1 creatine phosphate (CP) = 1 ATP; all 3 skeletal fiber types use this system short-term energy - used approx. 30 - 90 seconds into vigorous exercise; uses glycolysis to break down glucose to pyruvate to lactate (lactic acid); 1 glucose = 2 ATP; used by fast glycolytic fibers long-term energy - used approx after 2 min of vigorous exercise; uses glycolysis, citric acid cycle (kreb’s cycle), and electron transport chain to fully oxidize glucose; 1 glucose = 36 ATP (max); used by slow oxidative fibers and fast oxidative fibers (7th edition)
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7.3 - UNIT 7 Muscles and Muscle Tissue (Chapter 9) Skeletal...

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