Question

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

Answer 1

sample answer: When the muscle on the top of the arm relaxes and the muscle on the bottom of the arm contracts, the arm straightens. When the muscle on top of the arm contracts and the muscle on the bottom of the bone relaxes, the arm bends. Muscles work in pairs to create movement.

Step-by-step explanation:

Answer 2

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.

Step-by-step explanation: