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In multicellular organisms, cells are specialised to perform specific functions
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The first group of cells in an embryo are initially identical
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Muscle to churn and mix the stomach contents

Tissue: A collection of similar cells that perform a
specific function
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Epithelial Tissues: found in animals and consist of
sheets of cells
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Ciliated epithelium lines a duct such as the trachea
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Cell Specialisation
In Plants, an organ is made up of:
Palisade mesophyll made up of leaf palisade cells
that carry out photosynthesis
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Those made up of thin, flat cells that line organs where diffusion Epidermis to protect the leaf and allow gaseous
diffusion
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Xylem in plant cells is made up of a number of similar cell types
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Tissues:
Xylem to transport water and ions into the leaf
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they are made up of many tissues
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Absorb materials
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Organ Systems: Organs work together as a
single unit known as an organ system
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Respiratory System: used for breathing and gaseous exchange
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Excretory System: removes waste from body
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Lymphatic System: defends the body against pathogens
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Nervous System: collects and processes information via nerves and the brain
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Reproductive System: sex organs required for producing offspring
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