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Science lesson plan · 3rd grade (Year 4 in England) · 30 minutes

Skeleton and muscles

Human body and health

CCSS NGSS.4-LS1-1England: KS2 Y3 Animals, including humans

Objective and success criteria

Students will: Skeleton and muscles.

  • I can answer questions on today's skill on my own, without help.
  • I can explain each step and say why it works.
  • I can check my answer and spot a mistake.

Before and after

Needs first: Body parts and the five senses

Leads to: Major organs and their jobs; Skeleton jobs, joints and muscle pairs

Materials: Stopwatches, Body diagrams, Mini whiteboards, A diagram or short video clip of the idea, Printed student sheet (below).

Warm-up · 4 min

  • Quick retrieval from earlier learning (Body parts and the five senses). Students answer on mini whiteboards.
  • Show answers together and note who needs support in the main task.
  1. Which body part do you use for tasting salty crisps (chips)? (ears / skin / tongue / nose) → tonguePrompt: Is it about seeing, hearing, smelling, tasting or touching?
  2. Which of these do you do with your ears? (tasting a lemon / tasting salty crisps (chips) / feeling a prickly cactus / hearing a drum) → hearing a drumPrompt: Act out each one. Which body part are you using?
  3. Our senses: which statement is true? (Only fingers can feel touch. / Smell helps us taste food. / Each part of the tongue can only taste one flavour. / We hear with our eyes.) → Smell helps us taste food.Prompt: Think about what each body part does.

Hook · 3 min

  • Ask everyone to find their pulse, then jump for 30 seconds and find it again.
  • Share the objective: Skeleton and muscles. Read the success criteria together.

I do: model it · 7 min

  • Work through the example out loud, saying why you do each step, not just what you do.
  • Example: What are the three main jobs of the skeleton?
  • Step 1: The skeleton holds us up, protects organs and works with muscles so we can move.
  • Step 2: So the answer is: support, protection and movement
  • Answer: support, protection and movement
  • Pause after each step and ask a student to say what comes next.

We do: guided practice · 6 min

  • Do these together. Students try each step on whiteboards before you reveal it.
  • Use the hints as prompts rather than giving the answer.
  1. How do muscles move bones? (by growing longer / by pushing them / by melting / by contracting (getting shorter) and pulling on them) → by contracting (getting shorter) and pulling on themPrompt: Muscles can only pull, never push.
  2. Skeleton and muscles: which statement is true? (Babies and adults have exactly the same number of bones. / Muscles work in pairs. / Bones are dead, like rocks. / Muscles can push bones as well as pull them.) → Muscles work in pairs.Prompt: Think about what happens when you break a bone.

You do: independent practice · 7 min

  • Students work on the student sheet. Circulate and check the first two answers of every student early.
  • Students who finish: write a question of their own for a partner, with the answer.

The 6 questions are on the student sheet below, with answers in the key.

Exit ticket · 3 min

  • Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.
  1. Which bones protect the brain? (the ribs / the skull / the leg bones / the pelvis) → the skullPrompt: The brain is inside your head.
  2. Skeleton and muscles: which statement is true? (Bones are dead, like rocks. / The spine (backbone) protects the spinal cord. / Babies and adults have exactly the same number of bones. / Muscles can push bones as well as pull them.) → The spine (backbone) protects the spinal cord.Prompt: Think about what happens when you break a bone.

Watch out for

  • Everyday meanings of words getting in the way of the science meaning: define key words explicitly.
  • Remembering facts without the reason: ask "why?" and "what is the evidence?"

Support and stretch

Support

  • Review first: Body parts and the five senses.
  • Use concrete materials: stopwatches.
  • Give the first step of each question, or a partly worked example to finish.
  • Pair with a confident partner for the guided practice.

Stretch

  • Move on to: Major organs and their jobs; Skeleton jobs, joints and muscle pairs.
  • Explain a common mistake in writing and how to fix it.
  • Write a word problem that uses today's skill, then solve a partner's.

Homework and more practice

Free online practice with hints and printable worksheets for this skill: eurekami.com/science/grade-3.

Free lesson plan from eurekami.com/lesson-plan-builder

eurekami

Skeleton and muscles

Name

Date

Score/ 6

  1. Question 1

    Which part of the skeleton has the ring around it?

    • A. ribcage
    • B. arm bones
    • C. spine (backbone)
    • D. pelvis
  2. Question 2

    How do muscles move bones?

    • A. by growing longer
    • B. by pushing them
    • C. by contracting (getting shorter) and pulling on them
    • D. by melting
  3. Question 3

    Skeleton and muscles: which statement is true?

    • A. Bones are dead, like rocks.
    • B. Muscles can push bones as well as pull them.
    • C. Calcium helps keep bones strong.
    • D. Babies and adults have exactly the same number of bones.
  4. Question 4

    Which bones protect the brain?

    • A. the leg bones
    • B. the pelvis
    • C. the skull
    • D. the ribs
  5. Question 5

    Which bones protect the heart and lungs?

    • A. the toes
    • B. the skull
    • C. the ribcage
    • D. the arm bones
  6. Question 6

    To bend your arm at the elbow, which muscle contracts?

    • A. the heart
    • B. the biceps
    • C. the stomach
    • D. the triceps

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Answer key: Skeleton and muscles

  1. 1. C. spine (backbone)

  2. 2. C. by contracting (getting shorter) and pulling on them

  3. 3. C. Calcium helps keep bones strong.

  4. 4. C. the skull

  5. 5. C. the ribcage

  6. 6. B. the biceps