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Page 1

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Emily Hearn US2V
Biology A2 Revision: Communication

Outline the need for communication systems within multicellular organisms, with reference to the need to respond to
changes in the internal and external environment and to co-ordinate the activities of different organs.

Most animals and plants are complex, multicellular organisms
All living things…

Page 2

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Emily Hearn US2V
Biology A2 Revision: Communication

hormonal system uses the blood to transport signals. Cells in an endocrine organ release a hormone directly into the
blood it travels around the body but only specific target cells recognise the signal. This allows longer-term responses
to be enabled.

Define the terms…

Page 3

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Emily Hearn US2V
Biology A2 Revision: Communication

Some disadvantages are that they are less active in cooler temperatures and need to warm up before they can be
active, therefore in winter they may not be capable of activity so need sufficient stores of energy to survive the
winter.
When an…

Page 4

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Emily Hearn US2V
Biology A2 Revision: Communication

Behavioural Mechanisms to
Maintain Body Temperature

Behaviour if too hot Behaviour if
too cold

Move into shade or hide in a Move into
burrow) sunlight

Orientate body to decrease Orientate
surface area exposed to sun body to
increase
surface area
exposed to
sun…

Comments

Taj Dogra

very helpful :)

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