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Int. Nervous System

TermDefinition
Nervous System coordinate the body's system by receiving and sending information; maintaining homeostasis
Sensory Input Sensory receptors monitor changes, called stimuli, occuring inside and outside the body
Integration Nervous system processes and interprets sensory input and decides whether action is needed
Motor Output A response, or effect, activates muscles or glands
Nervous System Classifications Structural and Function
Structural classification Based on the structures of nervous system; CNS & PNS
Function classification Based on the activities of the nervous system; sensory(afferent) division & motor(efferent) division
Central nervous system Interprets incoming sensory information, issues outgoing instructions and integration. Organs: Brain & Spinal Cord
Peripheral nervous system Has nerves that serve as communication lines among sensory organs, the brain and spinal cord, and glands or muscles
Spinal Nerves Carry impulses to and from spinal cord
Cranial Nerves Carry impulses to and from brain
Sensory division (Afferent) Nerve fibers that carry information to the CNS
Somatic Sensory Fibers (Afferent) Fibers that carry information from the skin, skeletal muscles, and joints.
visceral Sensory (Afferent) Fibers carry information about visceral organs: soft internal organs
Motor(efferent) division Nerve fibers that carry impulses away from the CNS organs to the effector organs (muscles & glands)
Two Subdivisions of Motor Division Somatic and Autonomic
Somatic nervous system (Voluntary) controls skeletal muscles
Autonomic nervous system (Involuntary) Automatically controls smooth and cardiac muscles and glands.
Autonomic nervous system subdivision Further divided into the sympathetic and parasympathetic nervous systems.
Sympathetic Response Fight or flight or Freeze
Parasympathetic Rest and digest
Autonomic conflict Both branches activated simultaneously
Nervous Tissue Nervous tissue is made up of two principle cell types, supporting cells and neurons.
Supporting cells They resemble neurons, unable to conduct nerve impulses, and never lose the ability to divide.
Created by: oghosh
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