Its from Farah Afzal binti Mazlan of 5 Gastisia
Sent to me on the 17th March 2011 Via gmail.
How bones, skeletal muscles,tendons and joints bring out movement in the arms or leg ?
Skeletal muscles exist in pairs and are attached to humerus and ulna and radius in the hand across ligaments through the tendons. Tendons are tough, strong and inelastic. They join the skeletal muscles to the bones together at joints. Ligaments held the bones together at joints. They are flexible, strong and elastic. The movement of forelimb is brought by the contraction and relaxation of a pair of antagonistic muscles, biceps and triceps. The arm is flexed by the contraction of biceps and relaxation of triceps muscles. Contraction of biceps pulls the ulna up thus bending the arm. To straighten the arm, the triceps muscles contract while biceps muscles relax. Contraction of triceps muscles pulls the ulna down and arm is straightened.
Note: Sentences in red are the key sentences.
My Comment : Your essay is good. You scored 9/10. The essay is lacking in sentences for bones !
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