This chapter discusses the two divisions of the nervous system. Specifically, it examines the different features of the brain. The nervous system is composed of sections: the peripheral and the central. The peripheral nervous system deals with the relations of the organism to its external environment. It transmits information from various sensory receptors to the brain. It also intervenes in the regulation of major vital functions, maintaining the equilibrium of our internal environment by coordinating such essential activities as digestion, the circulation of the blood, respiration, and the secretion of hormones. In conjunction with the peripheral, the central nervous system integrates the information it receives and coordinates the activity of all parts of the bodies through the brain. The brain consists of two distinct regions—the cerebral cortex, which provides epigenetic regulation, and the subcortical regions, which enables an individual to adapt to its environment.
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