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Cell differentiation
What is it?

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.

We all start our lives as a single fertilised egg, a zygote, which then divides by mitosis.…

Page 2

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Xylem to transport water and ions into the leaf

NB: it is not always easy to determine which structures are organs. Blood capillaries are not
organs but both arteries and veins are.

Organ systems:

Organ systems are groups of organs that work together to achieve a major physiological
function some…

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