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(1) - K - Ulna,
L - Humerus
(ii) Movement of the lower arm takes place at the elbow which is between ulna and the humerous muscles. Involves are biceps and triceps which operate as a pair and their function is antagonistic. When the biceps/ flexor muscles contract, triceps/ extensor muscles relax. This pulls ulna and radius upward, thereby bending the arm or bringing the lower arm upward.
johnmulu answered the question on May 26, 2017 at 05:31
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