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Nervous System and Nervous Tissue
N/A
24
Anatomy
11th Grade
11/30/2011

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Cards

Term
Subthreshold Stimulus
Definition
A stimulus whose strength is too low to initiate a response.
Term
Neuron
Definition
A nerve cell.
Term
Depolarization
Definition
Change in the cell's membrane potential where the interior becomes less negative.
Term
Repolarization
Definition
The restoration of a polarized state across a membrane, as in a muscle fiber following contraction.
Term
Neurotransmitter
Definition
A chemical substance, such as acetylcholine or dopamine, that transmits nerve impulses across a synapse.
Term
Afferent
Definition
Carrying inward to a central organ or section, as nerves that conduct impulses from the periphery of the body to the brain or spinal cord.
Term
Efferent
Definition
Directed away from a central organ or section.
Term
Axon
Definition
The usually long process of a nerve fiber that generally conducts impulses away from the body of the nerve cell.
Term
Dendrite
Definition
A branched protoplasmic extension of a nerve cell that conducts impulses from adjacent cells inward toward the cell body. A single nerve may possess many dendrites. Also called dendron.
Term
Association/Interneuron
Definition
A nerve cell found entirely within the central nervous system that acts as a link between sensory neurons and motor neurons.
Term

PNS

(Peripheral nervous system)

Definition
Portion of the nervous system consisting of nerves and ganglia that lie outside of the brain and spinal cord.
Term

CNS

(Central nervous system)

Definition
Brain and spinal cord.
Term
Synapse
Definition
What information from one neuron to another neuron flows over.
Term
Synaptic Cleft
Definition
The tiny space between two nerve cells across which the neurotransmitter acetylcholine diffuses.
Term
Na+ K+ Pump
Definition
A protein in cell membranes that uses the energy of ATP to pump 3 sodium ions out of the cytoplasm while moving 2 potassium ions into the cytoplasm.
Term
Brain
Definition
An organ of soft nervous tissue contained in the skull of vertebrates, functioning as the coordinating center of sensation and intellect.
Term
Spinal Cord
Definition
The thick, whitish cord of nerve tissue that extends from the medulla oblongata down through the spinal column and from which the spinal nerves branch off to various parts of the body.
Term
Resting Potential
Definition
The potential difference between the two sides of the membrane of a nerve cell when the cell is not conducting an impulse.
Term
Polysynaptic Reflex Arc
Definition
The neural path of a reflex.
Term
Sensory Nerves
Definition
Nerves that contain process of sensory neurons and carry impulses to the CNS.
Term
Motor Neuron
Definition
Nerves that carry impulses leaving the brain and spinal cord, and destined for effectors.
Term
Pre-Synaptic Neurons
Definition
A neuron from the axon terminal of which an electrical impulse is transmitted across a synaptic cleft to the cell body or one or more dendrites of a postsynaptic neuron by the release of a chemical neurotransmitter
Term
Post-Synaptic Neurons
Definition
A neuron to the cell body or dendrite of which an electrical impulse is transmitted across a synaptic cleft by the release of a chemical neurotransmitter from the axon terminal of a presynaptic neuron.
Term
Summation
Definition
Accumulation of effects, especially those of muscular, sensory, or mental stimuli.
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