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Joints and muscle contraction

Muscles bend (flex) and straighten (extend) to allow you to work. Muscles bring about movement at
a joint. They can only pull they cannot push, so at least two muscles are needed to move a bone to
and fro. A pair of muscles that work in…

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Inside the muscle fibre there are also numerous myofibrils; each is composed if repeated contractile
units called sarcomeres.

A sarcomere is made up of 2 protein molecules; thin filaments made of actin (light band) and thicker
ones made of myosin (dark band). Contractions are brought about by the co-ordinated movement…

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8. This hydrolysis causes a change in the shape of the myosin head. It returns to its upright
position. This enables the cycle to start again.

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