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The nervous system in man, consists of two main parts, the and the The CNS is composed of the and the The largest portion of the brain is called the 1 and is responsible for thinking, reasoning, and memory. The is responsible for relaying sensory information The contains neurons that control body temperature, sleep, appetite and emotions and also regulates the release of hormones from the at the base of the brain. The brainstem connects the cerebral hemispheres to the spinal cord and is composed of the and The PNS is composed of the nerves that extend from the brain and spinal cord to the tissues of the body which are organized into divided into 12 pairs of and 31 pairs of In the PNS at the base of the brain. The brainstem connects the cerebral hemispheres to the spinal cord and is composed of the and The PNS is composed of the nerves that extend from the brain and spinal cord to the tissues of the body. which are organized into divided into 12 pairs of and 31 pairs of In the PNS nerves carry impulses to the brain and spinal cord, whereas I nerves carry impulses away from the brain and spinal cord. Nerves are composed of several or nerve cells.PNS nerves are further categorized into two subsystems : one system which is voluntary in nature and one which is mostly involuntary The involuntary system is further divided into the and nervous systems, two opposing mechanisms that provide balance in the body
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