Unicellular organism are independent entites with respect to the regulation of their metabolic activities. The metabolic activities of cells in a multicellular organism are influenced by external conditions. This regulation is part of a communication network of a broader sense by which different parts of an organism are informed about local events. Cellular information in animals is mediated by the central nervous and by endocrine systems. The central nervous system communicates through the nerve impulses of the neuron network. The endocrine system answers the challenges of the central nervous system communicated by chemical messengers, hormones. Primary messenger molecules do not enter cells. Their message is passed through intramembrane receptors of the plasma membrane releasing a second messenger forwarding information to enzymes and other proteins.
|Translated title of the contribution||Chapters from the 'Transfer of biological information'. Chapter XVI. Cell-cell interaction|
|Number of pages||3|
|Publication status||Published - Jan 1 1997|
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