3. 1. Smooth 2. Cardiac 3. Skeletal 1. 2. 3.

4. SSkeletal muscle forms all of the red meat around your body. TThey are what gives your body shape. OOver 40% of your body weight is skeletal muscle

7.  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.

8.  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.

9. MMuscles are made up of cells called muscle fibres. T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. TThere are 2 kinds of muscle fibre: SSLOW TWITCH FFAST TWITCH

10. SSLOW TWITCH – CCONTRACT SLOWLY WWITHOUT MUCH FORCE RRED IN COLOUR DDON’T TIRE EASILY SSUITED TO ENDURANCE ACTIVITIES FFAST TWITCH – CCONTRACT FAST WWITH A LOT OF FORCE WWHITE IN COLOUR TTIRE EASILY SSUITED TO ACTIVITIES THAT REQUIRE BURST OF STRENGTH & POWER