Question

Use the diagram to explain how muscles and bones work together to help bend the arm.

Answer 1

The flexor relaxes and the extensor contracts to straighten (or extend) the limb at the same joint. Muscles get their signals to contract and relax from the brain. Ligaments are long, fibrous straps that fasten bones together. Tendons are bands of fibrous tissue that connect muscles to bones.

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Answer 2

The muscles and bones work together to help bend the arm in the following way:

• Muscles tend to pull bones but they cannot push them back to their original position. So, the muscles form pairs of flexors and extensors to bend the arm or any other limb at any joint. The flexors contract the bones and after the completion of the movement, the extensors relax them.
• The muscles are attached to the skeletal system by tendons. When muscle contracts due to flexors the tendons act causing the movement. After the completion of the movement, the extensors work.

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