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Science

Skeleton and Muscles

Overview

Students explore the human skeleton and muscular system, discovering how bones and muscles work together as a mechanical system.

Learning Objective
Students understand the functions of the skeleton and muscles and how they work together to produce movement.

Resources needed

  • None — or a simple skeleton diagram drawn on paper or ground

Lesson stages

0 / 7 done
  1. 1 Ask: what would your body be like without a skeleton? (A bag of flesh — no shape, cannot move).
  2. 2 Introduce the three functions of the skeleton: support, protection, movement.
  3. 3 Ask: which organs does the skeleton protect? (Brain — skull, heart and lungs — ribcage, spinal cord — spine).
  4. 4 Introduce joints: where bones meet and movement happens (hinge joint — knee, ball and socket — shoulder).
  5. 5 Introduce muscles: attached to bones, muscles contract to pull bones — they cannot push.
  6. 6 Demonstrate: bicep contracts to bend arm, tricep contracts to straighten it — antagonistic pair.
  7. 7 Feel your own muscles contracting: touch your upper arm while bending and straightening.

Tap a step to mark it as done.

Variations

  • Make a simple model arm from card and rubber bands to show antagonistic muscles.
  • Compare the skeleton of a human, a bird, and a fish — same bones, different proportions.
  • Discuss what happens to muscles and bones when they are exercised regularly.
More information

Teach: skeleton, joint, muscle, contract, support, protect, hinge, antagonistic. The physical experience of feeling your own muscles contract is the most powerful teaching moment.

Focus on the three functions of the skeleton and one joint type before introducing the muscular system.

Can students name the three functions of the skeleton? Can they explain why muscles work in antagonistic pairs?

No resources needed. Students' own bodies are the resource. The rubber band model arm can be made from card and any elastic material.

Students sometimes think muscles both push and pull. Muscles can only contract (pull). The antagonistic pair arrangement is the key mechanical insight.

The skeleton and muscular system introduce biomechanics — the application of physics principles to biological movement. This connects to forces, levers, and energy in physics.

Activity details
Primary Easy 20–25 minutes no prep Whole Class, Small Group Indoor & Outdoor
Topics
Skeleton Muscles Human Body