How can you tell they’ve got it: Muscles Work in Pairs?

If they’ve got it, you’ll see things like: Explains why muscles can only pull, not push; Describes what happens to the bicep and tricep when the arm is bent and straightened; Gives another example of an antagonistic muscle pair. Or just try it together: 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?

Science Organisms & Life Processes Ages 11–13

Muscles Work in Pairs

Your child knows muscles can only pull, not push, so they work in pairs. To bend the arm one muscle pulls; to straighten it, its partner pulls the other way.

In curriculum terms

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

Ages are typical, not deadlines — follow your child’s pace. How to help at home →

How to tell they’ve got it

Tick these off as you see them — no test required.

Explains why muscles can only pull, not push
Describes what happens to the bicep and tricep when the arm is bent and straightened
Gives another example of an antagonistic muscle pair

🖨 Print this page to keep the checklist — it prints beautifully.

Try this together

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?

Where this sits on the map

Stuck here? Check the skills it builds on first. Confident? Here’s what it unlocks.

Builds on

Joints, Tendons & Ligamentsages 11–13Antagonistic muscles only make sense in the context of how muscles attach to bones via joints

Muscles Work in Pairsthis skill · ages 11–13

Unlocks

Nothing on the map depends on this yet.

solid = must come firstdashed = helps

Curriculum alignment

Where this fits in the official school curriculum — our best automated guess, not yet checked by a person.

This skill sits outside the F–6 Australian Curriculum — no candidate code matched (v0.1). No NSW K–6 outcome code matched (v0.1). No Victorian Curriculum 2.0 code matched (v0.1).

Nearby on the map

Calculating Dietary Energyages 11–13 Cells to Organ Systemsages 11–12 Cells Under the Microscopeages 11–12 Diet Imbalance & Deficiencyages 11–13

All Organisms & Life Processes skills →