1. Myology: the study of skeletal muscles
MUSCLES – 1B
Myology: the study of skeletal muscles

2. Types of Skeletal Muscle Fibers
Skeletal muscle fibers are categorized according to two characteristics
How they manufacture energy (ATP)
How quickly they contract
Oxidative fibers—produce ATP aerobically; with oxygen
Glycolytic fibers—produce ATP anaerobically by glycolysis

3. 3 CLASSES OF

4. Types of Skeletal Muscle Fibers
KNOW THESE PROTEINS
Types of Skeletal Muscle Fibers
1) Slow oxidative fibers
Red color due to abundant myoglobin
Obtain energy from aerobic metabolic reactions
Contain a large number of mitochondria
Contract slowly and resistant to fatigue
Fibers are small in diameter
Long distance runner

5. Types of Skeletal Muscle Fibers
2) Fast oxidative fibers
Contract quickly like fast glycolytic fibers
Are oxygen-dependent: aerobic
Have high myoglobin content
Somewhat fatigue resistant
More powerful than slow oxidative fibers
1500 m race

6. Types of Skeletal Muscle Fibers
3) Fast glycolytic fibers
Contain little myoglobin and few mitochondria
About twice the diameter of slow oxidative fibers
Contain more myofilaments and generate more power
Depend on anaerobic pathways
Contract rapidly and tire quickly

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