Bicep - Muscle that contracts to bend the arm at the elbow, Tricep - Muscle that contracts to straighten the arm at the elbow, Muscle - A tissue that contracts and relaxes to bring about movment at joints, Joints - Places where bones are able to move in different directions, Ligaments - Strong, cord-like tissues that attach to the ends of bones either side of joints, Antagonistic muscles - Muscles can only contract and relax, so they always work in these pairs, Tendons - Tough inelastic tissues that attach the bones in the joint to muscles, Cartilage - Tissue that covers the ends of bones at joints reducing friction and preventing wear and tear,

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