🔬 Science · Organisms & Life Processes

Muscles Work in Pairs

Explain that muscles work in antagonistic pairs — one contracts while the other relaxes — to produce movement, using the bicep and tricep as a key example

Typical age: 11–13 years

“If your child bent and straightened their arm, could they explain why two different muscles are needed — one to bend and one to straighten — and which muscle is which?”

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Joints, Tendons & LigamentsREQUIRED
Antagonistic muscles only make sense in the context of how muscles attach to bones via joints

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