Organisation

    AQA
    GCSE

    This topic explores the hierarchical structure of multicellular organisms, detailing how cells differentiate to form tissues, organs, and organ systems that work together to support life. It focuses on the physiology of the human digestive and circulatory systems, including the specific mechanisms of enzyme action, the cardiac cycle, and blood composition. Additionally, the topic covers plant organisation, examining the relationship between leaf structure and the transport systems of transpiration and translocation.

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    Objectives
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    Exam Tips
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    Key Terms
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    Mark Points

    Learning Objectives

    What you need to know and understand

    • Hierarchy of cells, tissues, organs, and organ systems.
    • Human digestive system: enzymes, lock and key theory, and food tests.
    • The heart and blood vessels: double circulatory system and vessel structure.
    • Blood: functions of plasma, red cells, white cells, and platelets.
    • Coronary heart disease: treatments including stents and statins.
    • Health issues and the effect of lifestyle on non-communicable diseases.
    • Cancer: benign and malignant tumours.
    • Plant tissues: leaf structure and function.
    • Plant organ system: transpiration and translocation.

    Key Terminology

    Essential terms to know

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