THE NERVOUS SYSTEM I pp. 1003-1015.

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THE NERVOUS SYSTEM I pp. 1003-1015

FUNCTION Network of cells (neurons) that communicate and control the body through electrical impulses (fast) versus chemicals in the endocrine system (slower) Includes neurons (cells that carry messages), brain and spinal cord

NEURONS

TYPES OF NEURONS sensory – sense organs/receptors send stimulus to CNS to process. motor – sends response from CNS to muscles/glands to react. interneurons – connect sensory and motor and carry impulses between them.

CENTRAL NERVOUS SYSTEM CNS Brain – control center with different sections controlling different parts of the body Spinal cord – column of nerve tissue that acts as a communication link between brain and Peripheral NS.

PERIPHERAL NERVOUS SYSTEM PNS Carries impulses to and from the CNS. Motor division (reacts to sensory input) 1. Somatic nervous system (voluntary): transmits impulses to and from skeletal muscle (including reflexes)

2. Autonomic nervous system (involuntary) – controls glands, internal organs, and other smooth muscle tissue (EX. Parasympathetic and sympathetic response to acute stress)

REFLEXES Sensory information does not need to be processed by the brain During a reflex the information is processed in the spinal cord

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