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Cell Differentiation and Organisation
In multicellular organisms, cells are specialised to perform specific functions.

Similar cells are then grouped together into tissues, tissues into organs and organs into
systems for increased efficiency.




Cell Differentiation
Multicellular organisms are made up from many different cell types.

All cells in an organism are…

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Tissues
For working efficiency, cells are normally aggregated together.

Such a collection of similar cells that perform a specific function is known as a tissue.



Tissue A collection of similar cells that perform a specific function


Examples of tissues:



Epithelial tissues
Epithelial tissues are found in most animals and consist…

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Organs
Just as cells are aggregated into tissues, tissues are aggregated into organs.

An organ is a combination of tissues that are coordinated to perform a variety of functions,
although they often have one predominant major function.

Organ A combination of tissues that are coordinated to
perform a variety of…

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Organ Systems
Organs work together as a single unit known as an organ system.

These systems may be grouped together to perform particular functions more efficiently.



There are a number of different organ systems in humans:

Organ System Function
Digestive system Digests and processes food
It is made up of…

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