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Module 1. Communication and Homeostasis.

The need for communication,

Keeping cells active
All living things need to maintain a certain limited set of conditions inside their cells. This is because the
cellular activities rely on the action of enzymes. You will recall from your AS work that enzymes need a…

Page 2

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A multicellular organism is more effective than a singlecelled organism, as its cells can be
differentiated. This means that its cells can be specialised to perform particular functions. Groups of
cells specialised in this way form tissues and organs. As a result the cells that monitor the blood may
be…

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