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Bair Ch. 6

Chapter 6: The Nervous System

worddefinition
Central Nervous System the division of the nervous system consisting of the brain and spinal cord
peripheral nervous system the division of the nervous system consisting of allof the nerves located outside the central nervous system
brain the part of the central nervous system that is locted in the skull and controls most function in the body
spinal cord the thick column of nervous tissue that links the brain to most of the nerves in the peripheral nervous system
cerebrum The part of the brain that interprets input from the senses, controls movement, and carries out complex mental processes.
cerebellum THe part of the brain that coordintates the actions of the muscles and helps maintain balance.
brain stem The part of the brain that lies between the cerebellum and spinal cord and controls the body's involuntary actions.
somatic nervous system the goup of nerves in the peripheral nervous system that controls voluntary action
autonomic nervous systemm The group of nerves in the peripheral nervous system that controls involuntary actions.
reflex an automatic response that occurs rabidly and without conscious control
concussion a bruiselike injury of the brain that occurs when the soft tissue of the brain collide against the skull
synapse the junction where one neuron can transfer an impulse to the next structure
sensory neuron a neuron that picks up stimuli from the internal or external environment and converts each stimulus into a nerve impulse
nerve a bundle of nerve fibers
motor neuron a neuron that sends an impulse to a muscle, or gland, causing the muscle or gland to react
interneuron a neuron that carries nerve impulses from one neuron to another
axon a threadlike extension of a neuron that carries nerve impulses away from the cell body
dendrite a threadlike extension of a neuron that carries nerve impulses toward the cell body
stimulus any change or signal in the environment that can make an organism react in some way
neuron a cell that carries information through the nervous system
nerve impulse the message carried by a neuron
response what the body does in reaction to a stimulus
cornea the clear tisse that cover the front of the eyes
pupil the opening through which light enters the eyes
iris the cirular stucture that surrounds the pupil and regulates the amount of light entering the eye
lens the flexible stucture that focuses light that has entered the eye
retina the layer or receptor cells at the back of the ey on which an image is focused
nearsightedness the condition in which a person can see mearby objects clearly
farsightedness the condition in which a person can see distant object clearly
eardrum the membrane that separates the outer ear from the middle ear, and that vibrates when sound waves strike it
cochlea a snail-shaped tube in the inner ear that is lined with receptor cells that respond to sound
semicircular canal structures in the inner ear that are responsible for the sense of balance
Created by: jlbair
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