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THE MUSCULAR SYSTEM

THE MUSCULAR SYSTEM. There are three types of Muscle. Smooth Cardiac Skeletal. 1. 2. 3. Muscle Facts. Skeletal muscle forms all of the red meat around your body. They are what gives your body shape. Over 40% of your body weight is skeletal muscle. Muscles on the Body.

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THE MUSCULAR SYSTEM

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  1. THE MUSCULAR SYSTEM

  2. There are three types of Muscle • Smooth • Cardiac • Skeletal 1. 2. 3.

  3. Muscle Facts • Skeletal muscle forms all of the red meat around your body. • They are what gives your body shape. • Over 40% of your body weight is skeletal muscle

  4. Muscles on the Body

  5. Muscles on the Body

  6. How Muscles Work • 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.

  7. How Muscles Work (continued) • Muscles usually work in pairs. • The bicep contracts (shortens) & flexes (bends) the elbow. • The triceprelaxes (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.

  8. Muscle fibres • Muscles are made up of cells called muscle fibres. • The 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. • There are 2 kinds of muscle fibre: • SLOW TWITCH • FAST TWITCH

  9. Muscle fibre types • SLOW TWITCH – • CONTRACT SLOWLY • WITHOUT MUCH FORCE • RED IN COLOUR • DON’T TIRE EASILY • SUITED TO ENDURANCE ACTIVITIES • FAST TWITCH – • CONTRACT FAST • WITH A LOT OF FORCE • WHITE IN COLOUR • TIRE EASILY • SUITED TO ACTIVITIES THAT REQUIRE BURST OF STRENGTH & POWER

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