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ScienceOrganisms & Life ProcessesAges 11–13

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

Lesson

Set out your lesson

Practise the bounded task in Muscles Work in Pairs; see exact limits before inferring broader coverage.

Before teaching

Use this short check, then start teaching.

Activity

Identify elbow and upper arm without needing to move your own body.

Policy

Exact directed source edges retained; earlier authorship is not learner attainment.

Printer, credit, and teaching notes

Exact directed source edges retained; earlier authorship is not learner attainment.

Materials

  • These supplied stage cards

  • Scrap paper and pencil; oral/pointing response where appropriate

Sequence

  • Read readiness and decide on support without treating prerequisite authoring as learner readiness.

  • Open Show first and explain its model.

  • Use Guided Try with support and its separate adult key.

  • Close Show and guided keys before Try, unless this Try is explicitly supported.

  • Reflect on an actual attempt, including help used.

No Printer

Use the supplied screen cards; copying the exact task to paper is optional, not required.

Privacy

Use only invented scenarios and optional anonymous local notes. Do not request names, photos, family finances, medical data, accounts or uploads. Stop uncomfortable physical activity.

Use the complete materials on screen or print only the current sheet. Keep adult guidance out of learner view.

Next: Show

Adult extras
Teaching limits and safe use

These are finite task opportunities, not proof of mastery. Record what was attempted and what support was used.

  • Not a medical or exercise assessment; pain-free optional demonstration is unnecessary, and detailed multi-muscle anatomy is outside scope.

Use only invented scenarios and optional anonymous local notes. Do not request names, photos, family finances, medical data, accounts or uploads. Stop uncomfortable physical activity.

Share teaching feedback

Continue learning
Share and support
Family records and proof options

Keep a record of your learning

Save photos, notes, and attendance. Export a proof packet for compliance or portfolio reviews.

View learner plans ($12/mo per learner) See sample family archive

Learning resources

Extra practice links — they do not replace Gakuva’s teaching approach.

KidsHealth · Practice link — not the full lesson

Bones, Muscles & Joints

Open practice (new tab)
Before you open · source notes

Bones, Muscles & Joints supports Muscles Work in Pairs. An adult previews and guides; this is a learning page, not a scored quiz.

Free educational page, no sign-in required for the tested path.

Before you open

Ask the learner one fact they learned and one question they still have.

Opening this link does not save learning or assess mastery.

Source, access and review notes

Public KidsHealth page. An anonymous GET on 2026-11-12 returned HTTP 200 with no login or payment prompt for this URL. Opening the link does not save practice or assess mastery. An adult should preview and guide the learner.

KidsHealth. “Bones, Muscles & Joints.” External page; Gakuva does not copy, host, embed, or redistribute materials.

Unknown — link only

Check understanding

  • 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
“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?”

Curriculum record

Type
Conceptual
Subject
Science
Domain
Organisms & Life Processes
Age range
Ages 11–13

Standards

uk-nc-2013:KS3.Sci.Bio.SkeletalMuscular.3