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The size of the nervous system ranges from a few hundred cells in the simplest worms, to around 300 billion cells in African elephants. The central nervous system functions to send signals from one cell to others, or from one part of the body to others and to receive feedback. Malfunction of the nervous system can occur as a result of genetic defects, physical damage due to trauma or toxicity, infection or simply of ageing.
Answer by Nickfighter1. Confidence votes 576. The nervous system maintains homeostasis by sending signals to the brain and the rest of the body. The parasympathetic system counteracts the sympathetic system. It sends messages that control all the systems in the body.he nervous system consists of the brain, spinal cord and nerves, all of which play a vital role in homeostasis.   For example: Thermoregulation, increase in body tempe â¦ rature.  In humans when the blood temperature is above average, receptors detect the heat.