The nervous system refers to the complex network of nerve cells throughout the body which control sensory input and motor output by communicating with the brain and spinal cord (central nervous system). This process is crucial in maintaining homeostasis.Mandal, A. (2017). What is the Nervous System? [online] News Medical Life Sciences. Available at: https://www.news-medical.net/health/What-is-the-Nervous-System.aspx [accessed 28 Nov. 2017]. (2018). Structures and Processes of the Nervous System. [online] Available at: https://studylib.net/doc/18072623/chapter-11-the-nervous-system [Accessed 16 Oct. 2018].