Revision questions on Communication, Homeostasis and Energy

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F214-Communication, Homeostasis and Energy

Module 1-Communication and Homeostasis

4.1.1 Communication

a. Outline the need for communication systems within multicellular organisms

* External environmental changes

o Changes in the external environment can cause stress.

o It may change slowly so there will be a gradual response.

o It may be a quick change so a rapid response is needed.

* Internal environmental changes

o The environment of internal cells is that they are protected by epithelial cells and they are bathed in tissue fluid.

o The activities of cells alter their environment e.g. releasing toxic products that need to be removed.

* Coordination of activities of organs

o Groups of specialised cells form tissues and organs.

o Cells monitor the blood and can release a substance into the blood to remove certain substances.

b. State that cells need to communicate with each other by a process known as cell signalling

* Cells need to communicate to ensure that the different parts of the body work together effectively.

* Cell signalling-The process where one cell releases a chemical that is detected by another cell