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What is differentiation?
The process by which cells in Multicellular
organisms become specialised for different
functions.
Cells organised into tissues
Tissues organised into organs
Organs organised into organ systems…read more

Slide 3

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Cell differentiation-process
All cells in an organism are initially identical
As a cell matures, it takes on its own individual
characteristics that suit it to the function that it
will perform, when it has matured.
Each cell is specialised in structure to suit the role
it will carry out.
It's not just the shape that varies but also the
number of each of its organelles.
Every cell contains the same genes for its
development, the cell differentiates due to the
number of genes switched on (Expressed) or off.…read more

Slide 4

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What are tissues?
Collection of similar cells aggregated together
to perform a specific function
For them to work efficiently cells are
AGGREGATED TOGETHER.
E.g epithelial cells and xylem.…read more

Slide 5

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What are organs?
Aggregation of tissues performing physiological
functions.
Combination of tissues that are co-ordinated to
perform a variety of functions, although they do
have one predominant function.
Lungs, heart, stomach, leaf
Artery and vein : made up of may tissues-
epithelial, muscle and connective. Have one
predominant function- to carry blood
(transportation of blood)
Blood capillary X- has the same one function BUT
made up of just one tissue- epithelium!…read more

Slide 6

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What are organ systems?
Where organs work together in a single unit
These systems may be grouped together to
perform particular functions more efficiently.
Digestive system, respiratory system,
circulatory system .…read more

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