The nervous system is one of the most important systems of the human body whose major function is to control the internal constancy of the internal environment of the body through the process of homeostasis. The nervous system provides direct control of the muscles and glands by the somatic and autonomic motor systems. While the somatic system controls the muscles of respiration, the autonomic nervous system controls the smooth muscle, cardiac muscle, exocrine glands and adrenal medulla . The nervous system also provides appropriate outputs via the somatic motor system, which lead to behavioral responses, such as feeding, drinking and Continue reading...