Blood Components Functions

Overview

This 60-minute lesson is designed for Year 8 students in line with the National Curriculum for England (Programme of Study: KS3 Science – Biology - The circulatory system). The focus is on identifying and describing the functions of the components of blood, helping students understand how blood supports body systems.

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Curriculum References

• National Curriculum KS3 Science - Biology:
  • Pupils should be taught to:
    • Describe and explain the functions of the components of blood (red blood cells, white blood cells, platelets, plasma) and how they contribute to health and fighting disease (DfE, 2014).
  • Working scientifically:
    • Using classification keys to identify and group living things according to observable features, which can be extrapolated to classify blood components by their characteristics.

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Learning Objectives (WALT)

• WALT identify the main components of blood.
• WALT describe the function of red blood cells, white blood cells, platelets, and plasma.
• WALT explain how these components contribute to overall health and disease defence.

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Success Criteria

By the end of the lesson, students will:

• Correctly name the four key blood components.
• Accurately match each component to its function.
• Provide simple explanations of how blood supports bodily functions and immunity.
• Demonstrate understanding through participation in an interactive group activity and a short quiz.

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Resources Needed

• Large coloured diagrams/posters of blood components
• Mini whiteboards and markers
• Blood component role cards (red blood cell, white blood cell, platelet, plasma)
• Dyslexia-friendly fact sheets (using clear, concise language, bullet points, and coloured overlays if needed)
• Quiz sheets and pencils
• Zoomed microscope images of blood smears (printed)
• "Blood cell" models or play dough (for tactile learners)

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Lesson Structure

1. Starter (10 mins)

• Engage with a mystery box: Present a closed box labelled “What’s in blood?” Ask students to brainstorm what they think blood contains and what it might do.
• Quick interactive Q&A to gauge prior knowledge.
• Show a real microscope image and a simple diagram of blood and its components.

2. Introduction / Direct Teaching (15 mins)

• Present a clear, labelled diagram of the four key components of blood.
• Explain each component’s function:
  • Red Blood Cells: Carry oxygen using haemoglobin.
  • White Blood Cells: Fight infection/immune response.
  • Platelets: Help blood clotting to prevent bleeding.
  • Plasma: Transports nutrients, hormones, and waste.
• Use a visual analogy: Blood as a delivery and defence service in the body.

3. Main Activity (20 mins)

• Role-play Group Activity:

  • Divide class into four groups. Assign each a blood component role card.
  • Each group prepares a 2-minute mini-presentation describing their component’s function creatively (e.g., as a superhero, courier, or builder).
  • Groups present to the class.

• Matching Game (for QA and reinforcement):

  • On mini whiteboards, students write down the function when shown each blood component picture or name.

4. Plenary (10 mins)

• Recap learning via a quick quiz (multiple choice or short answer).
• Discuss why understanding blood is important for human health.
• Highlight how deficiencies or problems with blood components can cause diseases (brief mention of anaemia, infection).

5. Assessment (Formative & Summative)

• Formative: Observation during role-play and questioning.
• Summative: Short quiz scored for accuracy.
• Peer/self-assessment: Using a checklist to confirm if they met the success criteria.

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Differentiation Strategies

Learner Type	Strategies
Lower ability / SEN	Use dyslexia-friendly sheets, sentence starters, and visual aids. Allow verbal or modelled responses.
EAL learners	Pre-teach key vocabulary with images; use bilingual glossaries if available.
Kinesthetic learners	Use play dough to model blood components; role-play emphasises movement and agency.
Visual learners	Colour-coded diagrams, videos (if available), and interactive matching games.
Auditory learners	Group presentations and discussion to reinforce learning through listening and speaking.

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Extension Activities for Advanced Learners

• Research and present on how blood diseases (e.g., sickle cell anaemia or leukaemia) affect blood components and function.
• Create a detailed poster showing how blood flows through the heart and lungs, linking with oxygen transport by red blood cells.
• Write a short explanatory text comparing plasma with other bodily fluids, focusing on its transport functions.

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Dyslexia-Friendly Strategies

• Use a font like Arial or Comic Sans at size 14+ on printed worksheets.
• Present information in bullet points with short, simple sentences.
• Include clear, high-contrast colour backgrounds behind text blocks (e.g., pastel yellows or blues).
• Provide readers with coloured overlays or coloured paper options.
• Use diagrams with labelled arrows rather than paragraphs of text.
• Allow audio versions of reading materials or read aloud during explanation time.

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Teacher Reflection Prompts

• Were students able to correctly identify and describe blood components by the end?
• Did role-play enhance understanding and engagement?
• How did the differentiation impact participation, especially for SEN students?
• What evidence shows students applied scientific vocabulary accurately?
• How could this lesson link into upcoming topics on the circulatory or immune systems?

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By following this plan strictly aligned to the KS3 National Curriculum Biology standards and incorporating multisensory, inclusive strategies, this lesson will engage a diverse Year 8 class effectively. It should "wow" teachers through its clear structure, creativity, and strong emphasis on formative assessment opportunities.