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Nervous System

Vocabulary

TermDefinition
Neuron basic functioning unit of the nervous system, made up of a body cell, dendrites and axons
Impulse any message carried by a neuron
Dendrites a neuron structure that receives impulses (messages) from other neurons and send them to the cell body
Axon a neuron structure that carries impulses (messages) away from the cell body
Sensory Neurons receive information and send impulses to the brain or spinal cord
Interneurons relay sensory neuron impulses to motor neurons
Motor Neurons conduct impulses from the brain or spinal cord to muscles or glands throughout the body
Synapse a small space across which an impulse moves from an axon to dendrites or cell body of another neuron
Central Nervous System division of the nervous system, made up of the brain and spinal cord
Cerebellum part of the brain that controls voluntary muscle movements, maintains muscle tone and helps maintain balance
Cerebrum largest part of the brain where memory is stored, movements are controlled and impulses from the senses are interpreted
Brain Stem connects the brain to the spinal cord
Spinal Cord an extension of the brain stem made up of neurons that carry impulses from all parts of the body to the brain and from the brain to all parts of your body
Peripheral Nervous System the brain and spinal cord are connected to the rest of your body by the PNS
Somatic Nervous System a division of the PNS which controls voluntary actions
Autonomic Nervous System a division of the PNS which controls involuntary actions such as heart rate, breathing and digestion
Reflex an involuntary, automatic response to a stimulus controlled by the spinal cord
Reflex Arc a simple nerve pathway
Stimulant a drug that speeds up the activities of the Central Nervous System
Depressant a drug that slows the activities of the Central Nervous System
Paralysis the loss of muscle movement
Cornea the transparent section at the front of the eye
Retina -a tissue at the back of the eye that is sensitive to light energy -two types of cells, rods(dim light) and cones (bright lights and color)
Lens directs the light onto the cornea of the eye
Concave Lens -a lens that is thicker at the edges than in the middle -causes parallel light to spread out
Convex Lens -a lens that is thicker in the middle and thinner on the edges
Nearsightedness a nearsighted person can not see distant objects because the image is focused in the front of the retina
Farsightedness a farsighted person cannot see close because the image is focused behind the retina
Created by: cneeson