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Introduction to Nerve Cells and Nervous Systems

  • A. G. Brown

Abstract

The essence of nervous system function is control by means of communication. Unicellular (acellular) organisms, such as Amoeba or Paramecium, can perform every function necessary to sustain their lives. They can take in nutrients from their external environment, organize their metabolic reactions, excrete waste products and move towards or away from objects in their external environment; that is, they can perform simple behavioural adjustments. These actions are performed without the aid of a nervous system as such. In multicellular organisms more complex than sponges the constituent cells have become specialised into organs and tissues for carrying out specific functions, such as digestion and assimilation of foodstuffs, respiration, circulation of the blood to carry oxygen, metabolites and hormones to and from the tissues, reproduction and so on. In these organisms the nervous system and the endocrine system together carry out the function of control and communication, between the various organs and tissues of the body and between the organisms and its external environment.

Keywords

Spinal Cord Cell Body Nerve Cell Peripheral Nervous System Choroid Plexus 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag London 2001

Authors and Affiliations

  • A. G. Brown
    • 1
  1. 1.Department of Preclinical Veterinary Sciences, Royal (Dick) School of Veterinary StudiesUniversity of EdinburghEdinburghUK

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