You will learn
- State skeleton jobs.
- Name joint types.
- Explain muscle pairs.
- Describe healthy habits.
Version 0.2 · expanded edition · built from cited public sources Content is based on the official frameworks and sources listed under Sources and standards. No official endorsement is claimed. Written in the style of common primary school assessments. No exam result is promised.
Student lesson
Words to know
the framework of bones
where two bones meet
joins muscle to bone
two muscles that pull in opposite ways
1. Discover: The bending arm
Dayo bends his arm and feels the muscle on the front of his upper arm bulge. When he straightens it, the muscle at the back tightens. “Muscles can only pull,” says his teacher. “So they work in pairs.”
Think: Which muscle shortens when you bend your arm?
2. Understand: Bones and muscles
Idea 1: Skeleton
The skeleton supports the body, protects organs (the skull protects the brain, ribs protect lungs), allows movement and makes blood cells in bone marrow. Adults have 206 bones.
Idea 2: Joints
A joint is where bones meet. Hinge joints (knee) move one way; ball-and-socket joints (shoulder) move many ways. Tendons join muscle to bone.
Idea 3: Muscles
Muscles can only pull. In an antagonistic pair such as biceps and triceps, one contracts while the other relaxes to move a bone.
3. Worked examples
Example 1 (I show you): Name
Joints.
- Hinge.
- Ball and socket.
- Examples.
Answer: Two types.
Example 2 (We do it together): Explain
Pairs.
- Biceps pulls up.
- Triceps pulls down.
- Relax.
Answer: Opposite pulls.
Example 3 (You try): List
Bone jobs.
Show the steps and answer
- Support.
- Protect.
- Make blood.
Answer: Four jobs.
Did you know?
Babies are born with about 270 to 300 bones; many fuse into the 206 adults have.
Why this matters
A healthy skeleton and muscles keep us strong and mobile.
4. Explore: Arm model
Build a model arm from two cardboard strips, a split pin joint and two elastic bands, and show how pulling one band moves the arm.
- Make the arm.
- Fit the pin.
- Add bands.
- Pull and watch.
Think about it: what did you notice?
What did you notice? One band pulled while the other relaxed.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- The ___ is the framework of bones.
- A ___ is where two bones meet.
- A ___ joins muscle to bone.
- An ___ pair works in opposite ways.
Guided practice
Question 1. How many bones in an adult?
206.
Question 2. What is a joint?
Where bones meet.
Question 3. What is a tendon?
Muscle to bone.
Independent practice
Level 1: Start
- How many bones in an adult?
- What is a joint?
- What is a tendon?
- What pulls?
- What protects the brain?
Level 2: Grow
- Why pairs?
- Why joints?
- Why calcium?
Level 3: Stretch
- Build the arm.
- Label.
- Explain.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
Explain how biceps and triceps move the arm.
Show a sample answer
Use contract and relax.
Another one. Tell a family member one thing from this lesson. Use the words you learned.
Show a sample answer
A clear sentence that uses at least one word from Words to know.
7. Common mistakes
Fix: Only pull.
Fix: Living tissue.
8. Lesson summary and revision card
- I can state skeleton jobs.
- I can name joint types.
- I can explain muscle pairs.
- I can describe healthy habits.
9. Check and master
Answer all 14 questions. You will see feedback after each one.
Your result appears here after you answer every question.
10. Key takeaways
- The skeleton supports and protects.
- Joints allow movement.
- Muscles can only pull.
- Muscles work in pairs.
11. Next lesson
Next lesson: Reproductive system introduction. Keep going with the next idea in this course.
Exam practice
These questions are written in the style of common school and international primary assessments. Try them on your own, without looking back. Then check your answers in the marking guide. The marks are shown in brackets.
- Define joint and tendon. [2 marks]
- Name three jobs of the skeleton. [3 marks]
- Explain an antagonistic pair. [3 marks]
- Safety rule. [2 marks]
Total: 10 marks.
Marking guide and model answers
- 1 each
- 1 each
- Contract [1]; relax [1]; movement [1]
- Any [1]; reason [1]
Score guide: 9 to 10 = secure. 6 to 8 = nearly there, revise the parts you missed. Under 6 = work through the lesson again with a grown-up.
Printable worksheet
- How many bones in an adult?
- What is a joint?
- What is a tendon?
- What pulls?
- What protects the brain?
- Why pairs?
- Why joints?
- Why calcium?
- Build the arm.
- Label.
Homework
Find three joints on your body and name their type.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. How many bones in an adult? | 206. | 1 |
| 2. What is a joint? | Where bones meet. | 1 |
| 3. What is a tendon? | Muscle to bone. | 1 |
| 4. What pulls? | Muscles. | 1 |
| 5. What protects the brain? | Skull. | 1 |
| 6. Why pairs? | Pull only. | 1 |
| 7. Why joints? | Movement. | 1 |
| 8. Why calcium? | Strong bones. | 1 |
| 9. Build the arm. | Photo. | 1 |
| 10. Label. | Labels. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 206.; 2 Where bones meet.; 3 Muscle to bone.; 4 Muscles.; 5 Skull.. Level 2: 1 Pull only.; 2 Movement.; 3 Strong bones.. Level 3: 1 Photo.; 2 Labels.; 3 Sentence..
Quiz answers: 1 B, 2 C, 3 A, 4 B, 5 C, 6 A, 7 B, 8 C, 9 A, 10 B, 11 C, 12 A, Challenge 1 B, Challenge 2 C.
Mastery and remediation
| Objective | Bronze (Developing) | Silver (Proficient) | Gold (Advanced) |
|---|---|---|---|
| O1 State skeleton jobs | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O2 Name joint types | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O3 Explain muscle pairs | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O4 Describe healthy habits | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
Courseversity badge thresholds (overall quiz score): Gold = 90–100%; Silver = 80–89.9%; Bronze = 70–79.9%. A badge is never a full record of progress.
If a learner struggles
- Find the misconception: “Muscles can push.” Only pull.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Explain bones and muscles.
- Guided practice: work through one example together and let the learner try the next one.
- Reassess: use the quiz again or the worksheet.
- Move on when the learner shows Silver-level evidence independently.
For parents and guardians
In this lesson your child studies bones and muscles. You do not need to be an expert to help.
- Feel muscles move.
- Ask “Which muscle?”
- Encourage play and calcium-rich food.
- Ask “how do you know?” after each answer, and listen.
- Praise effort, not only right answers. Mistakes are how we learn.
- Ten to fifteen minutes a day is better than one long session.
Teacher package
1–5. Objectives, prerequisites, materials, preparation, duration
Lesson objectives. Learners will: state skeleton jobs; name joint types; explain muscle pairs; describe healthy habits.
Prerequisite knowledge. Grade 5 ideas: the main organs, the senses, healthy eating and keeping the body healthy.
Materials. Card, split pins, elastic bands. Low-resource options: use chalk or charcoal on a board or wall, drawings in the sand, and objects from the classroom instead of printed materials.
Preparation. Cut cardboard.
Suggested duration. 45–60 minutes. It can be split into two shorter sessions.
6–9. Teaching procedure, explanation notes, guided and independent activities
Introduction (5 min). Ask learners to bend their arm and feel their muscles.
Explanation (10 min). Teach bones and muscles.
Guided activity (10 min). Learners model.
Independent activity (10 min). Learners explain.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. Which muscle pulls? What relaxes?
Teacher explanation notes. Start with real objects and safe, hands-on observation. Then talk about what was seen, then draw and write. Always say “how do you know?”. Keep to the safety notes, and use local, safe materials.
10–12. Differentiation, formative assessment, common misconceptions
Support. Use real objects and pictures, short sentences and a partner. Let learners point, show or draw instead of writing. Extension. Ask learners to find a new example at home and explain how they know.
Formative assessment. Listen to learners read and explain, ask “how do you know?”, and check the independent work.
Misconceptions. “Muscles can push.” Only pull.
13–15. Assessment questions, answer keys, marking scheme
Use the quiz, the 10-mark exam practice and the worksheet on this page. All answers and marking guides are in the answer sections above. Re-check every answer before use.
16–19. Remediation, enrichment, homework, teacher reflection
Remediation. Explain bones and muscles. Enrichment. Look for one new example near your home or school, draw it and explain it to someone. Homework. See above.
Teacher reflection. After teaching, record: which ideas learners understood; which misconceptions occurred; which activities worked; which learners need more practice; and what to improve next time.
Sources and standards
This lesson is based on the sources below, and no official endorsement is claimed. Reference starting points: Next Generation Science Standards, Cambridge Primary Science and the IB Primary Years Programme. Where a standard code is named, it points to the official framework.
Research used to shape this lesson. Courseversity Science curriculum, Grade 6 Unit 4, topic 6; Next Generation Science Standards, structure and function in organisms; Cambridge Lower Secondary Science, human biology; IB Primary Years Programme, who we are. These sources informed the lesson.