MSC PE Studies1A 1 Physical Education Studies 1A Functional Anatomy 3.

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MSC PE Studies1A 1 Physical Education Studies 1A Functional Anatomy 3

MSC PE Studies1A 2 Skeletal Muscle Muscles consist of a muscle belly with a fibrous tendon at either end which attaches to bone.

MSC PE Studies1A 3 Microstructure of Skeletal Muscle MuscleFibreMyofibrilsSarcomeres Protein Filaments MyosinActin

MSC PE Studies1A 4 Sliding Filament Theory As the actin filaments move to the centre, the sarcomere shortens. Sliding Filament Theory Sliding Filament Theory

MSC PE Studies1A 5 Types of Muscle Fibres Fast-Twitch (type ll) White Fibres Slow-Twitch (type l) Red Fibres RED OR SLOW TWITCH OR TYPE l FIBRES WHITE OR FAST TWITCH OR TYPE ll FIBRES Relatively slow contraction speed Rapid Contraction Mainly Aerobic Pathway Anaerobic ATP Production Contract repeatedly for continuous activity Fatigue More Quickly

MSC PE Studies1A 6 Relationship between selected activities and fibre type Patterns of muscle fibre distribution are most evident in highly trained athletes. Endurance athletes have predominantly slow-twitch fibres, while sprint athletes have mainly fast-twitch fibres activated.

MSC PE Studies1A 7 Activity Untrained Marathon Runners SwimmersSprintersCyclists Race Walkers 800m Runners Discus Throwers Orienteers Distance Runners CanoeistsWeightlifters FAST TWITCH SLOW TWITCH