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Published byLinda Farmer Modified over 9 years ago
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1. Smooth 2. Cardiac 3. Skeletal 1. 2. 3.
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SSkeletal muscle forms all of the red meat around your body. TThey are what gives your body shape. OOver 40% of your body weight is skeletal muscle
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Muscles are attached to bone by tendons. Where the muscle is attached to a stationary bone is called the origin. Where the muscle is attached to the moving bone is called the insertion.
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Muscles usually work in pairs. The bicep contracts (shortens) & flexes (bends) the elbow. The tricep relaxes (lengthens) as this happens. To straighten the elbow the opposite would happen, the bicep would relax & the tricep would contract. This is called antagonistic muscle action, the working muscle is called the prime mover (agonist) the relaxing muscle is called the antagonist.
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MMuscles are made up of cells called muscle fibres. TThe amount of fibres that contract depends on the force needed. E.g. more fibres contract when you lift a shot put than when you lift a pen. TThere are 2 kinds of muscle fibre: SSLOW TWITCH FFAST TWITCH
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SSLOW TWITCH – CCONTRACT SLOWLY WWITHOUT MUCH FORCE RRED IN COLOUR DDON’T TIRE EASILY SSUITED TO ENDURANCE ACTIVITIES FFAST TWITCH – CCONTRACT FAST WWITH A LOT OF FORCE WWHITE IN COLOUR TTIRE EASILY SSUITED TO ACTIVITIES THAT REQUIRE BURST OF STRENGTH & POWER
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