Why are communication systems needed for multicellular organisms, what are these syst

Here are some ideas as to why organisms need a communication system.

* To respond to changes in their external environment
(Such as temperature)
The changes can occur slowly e.g. as the seasons change from summer -> winter
- or quite rapidly day/night

In order to survive and reduce stresses such as high/low temperatures the organism will need a communication system that can monitor changes and bring about a response.
This response can be behavioural or physiological.



* To respond to changes in their internal environment
e.g
When cells are going through metabolic activities they produce waste products such as CO2. When dissolved in water it forms carbonic acid.
If this was to build up in the tissue fluid it would lower the pH of the surrounding environment. This would disrupt the activity of enzymes.


* To coordinate the the functions of the different systems
Multicellular organisms have differentiated (Specialized) cells that perform specific functions. A communication system is needed that allows all the different parts to communicate with each other


A good communication needs to be able to:These systems are hormonal (endocrine) or neuronal


one uses the blood to transport chemical signals which are carried all over the body (circulatory system) but the signal only produces a response in target cells, ones which have the specific receptor on their cell surface membrane?
-Slower but allows for long term responses such as hormones


The other uses the network of neurons to send electrical signals across synapses. -Very fast transmission and responses


You might want to find out more on negative feedback and homeostasis