You will learn
- Name muscle types.
- Explain antagonistic pairs.
- Describe how muscles move bones.
- Link exercise to strength.
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
tissue that contracts to cause movement
a cord joining muscle to bone
to shorten and pull
to lengthen and release
1. Discover: The bending arm
Kojo bends his arm and feels the muscle on the front bulge. When he straightens it, the muscle at the back tightens. “One muscle pulls it up and the other pulls it down,” says his teacher.
Think: Why do muscles need to work in pairs?
2. Understand: Muscles
Idea 1: Pulling
A muscle can only pull by contracting. It is joined to bone by a tendon. When it relaxes, it goes back to normal length.
Idea 2: Pairs
Because muscles cannot push, they work in pairs. The biceps bends the elbow and the triceps straightens it.
Idea 3: Three types
Skeletal muscles move bones and we control them. Smooth muscles move food in the gut. Cardiac muscle is in the heart and works without rest.
3. Worked examples
Example 1 (I show you): Explain
Bend arm.
- Biceps contracts.
- Triceps relaxes.
- Pull.
Answer: The biceps contracts.
Example 2 (We do it together): Name
Heart muscle.
- Cardiac.
- Never rests.
- Pumps.
Answer: Cardiac muscle.
Example 3 (You try): Explain
Why pairs.
Show the steps and answer
- Cannot push.
- Pull back.
- Pair.
Answer: They only pull.
Did you know?
The strongest muscle for its size is the masseter, which closes the jaw with a force over 80 kilograms.
Why this matters
Strong muscles help us move, work and stay healthy.
4. Explore: Muscle model
Make a cardboard arm with two elastic bands as biceps and triceps and show how they pull in turn.
- Cut two card strips.
- Join with a fastener.
- Add two bands.
- Pull each band in turn.
Think about it: what did you notice?
What did you notice? Pulling one band bent the arm; the other straightened it.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- A ___ contracts to cause movement.
- A ___ joins muscle to bone.
- To ___ is to shorten.
- Muscles ___ to return.
Guided practice
Question 1. What does a muscle do?
Pulls.
Question 2. What is a tendon?
Cord.
Question 3. What is contract?
Shorten.
Independent practice
Level 1: Start
- What does a muscle do?
- What is a tendon?
- What is contract?
- Name a pair.
- Name a type.
Level 2: Grow
- Why pairs?
- Why cardiac strong?
- Why exercise?
Level 3: Stretch
- Build the arm.
- Feel the muscles.
- Explain.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
Explain how your arm straightens.
Show a sample answer
Use triceps.
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: They pull.
Fix: Cardiac muscle.
8. Lesson summary and revision card
- I can name muscle types.
- I can explain antagonistic pairs.
- I can describe how muscles move bones.
- I can link exercise to strength.
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
- Muscles pull but cannot push.
- Muscles work in pairs.
- Three types: skeletal, smooth and cardiac.
- Exercise strengthens muscles.
11. Next lesson
Next lesson: Nervous 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 muscle and tendon. [2 marks]
- Name three muscle types and jobs. [3 marks]
- Explain biceps and triceps. [3 marks]
- Safety rule. [2 marks]
Total: 10 marks.
Marking guide and model answers
- 1 each
- Name [1] each
- Biceps contracts [1]; triceps relaxes [1]; reverse to straighten [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
- What does a muscle do?
- What is a tendon?
- What is contract?
- Name a pair.
- Name a type.
- Why pairs?
- Why cardiac strong?
- Why exercise?
- Build the arm.
- Feel the muscles.
Homework
Feel your biceps while bending your arm and describe it.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What does a muscle do? | Pulls. | 1 |
| 2. What is a tendon? | Cord. | 1 |
| 3. What is contract? | Shorten. | 1 |
| 4. Name a pair. | Biceps and triceps. | 1 |
| 5. Name a type. | Cardiac. | 1 |
| 6. Why pairs? | Only pull. | 1 |
| 7. Why cardiac strong? | Never rests. | 1 |
| 8. Why exercise? | Stronger. | 1 |
| 9. Build the arm. | Photo. | 1 |
| 10. Feel the muscles. | Notes. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 Pulls.; 2 Cord.; 3 Shorten.; 4 Biceps and triceps.; 5 Cardiac.. Level 2: 1 Only pull.; 2 Never rests.; 3 Stronger.. Level 3: 1 Photo.; 2 Notes.; 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 Name muscle 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 |
| O2 Explain antagonistic 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 |
| O3 Describe how muscles move bones | 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 Link exercise to strength | 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 push bones.” They pull.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Explain muscle pairs.
- 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 learns about muscles. You do not need to be an expert to help.
- Feel arm muscles.
- Ask “Which one pulls?”
- Gentle exercise.
- 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: name muscle types; explain antagonistic pairs; describe how muscles move bones; link exercise to strength.
Prerequisite knowledge. Grade 4 ideas: the skeleton, muscles, teeth, digestion basics, the heart and healthy habits.
Materials. Card, bands, fasteners. 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 card.
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). Bend an arm and ask, “What is pulling?”
Explanation (10 min). Teach muscles.
Guided activity (10 min). Learners build.
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 push bones.” They 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 muscle pairs. 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 5 Unit 2, topic 6; Next Generation Science Standards, structure and function in organisms; Cambridge Primary Science Stage 5, biology: humans and animals; IB Primary Years Programme, who we are. These sources informed the lesson.