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Musculature - Musculature Structure of the Muscle Fiber...

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Musculature Structure of the Muscle Fiber: Muscle fiber - Connective tissue: Epimysium Perimysium Endomysium around Sarcolemma Sarcolemma around muscle fiber Muscle fiber - contractile element: made up of many myofibrils o these are embedded in the sarcoplasm each myofibril has bands of actin (thin) and myosin (thick) filaments o these slide to attract one another in long muscles whose fibers run parallel to the long axis of the muscle: o bundles of fibers function together as though the individual fibers ran the entire length of the muscle
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Differentiation in Muscle Fibers: o Type I - Slow Twitch o Type IIa & IIb - Intermediate and Fast Twitch
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Slow Twitch (Type I) o high aerobic capacity o for endurance - slow to fatigue o well vascularized o high glycolitic capacity o high power and strength (large cross-section) o fast fatiguing There is usually a 50/50 split between slow twitch and fast twitch muscle fibers However, there can be 80% fast twitch to 20% slow twitch or vice versa - if so,
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Musculature - Musculature Structure of the Muscle Fiber...

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