THE MUSCULAR SYSTEM
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Transcript of THE MUSCULAR SYSTEM
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THE MUSCULAR SYSTEM
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There are three types of Muscle
1. Smooth
2. Cardiac
3. Skeletal
1.
2.
3.
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Muscle FactsSkeletal 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
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Muscles on the Body
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Muscles on the Body
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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.
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How Muscles Work (continued)
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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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
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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