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Chapter 3 Definition

CHS Psychology class Jack- Chapter 3 Definitions

Cell Body The main section of neuron that contains the nucleus.
Nucleus Contains the genetic information that determines how the cell will function.
Dendrites Fibers that receive signals from other neurons. And carry those signals to the cell body.
Axon Fibers that send signals to where communication occurs with other neurons.
Myelin Fatty substance that wraps around axons and increases the speed of action potentials
Synapse The tiny gap between neurons across which the neurons communicate.
Receptor Sites on the surface of cells that allow only one type of neurotransmitter to fit into them, triggering a chemical response that may lead to an action potential.
"All or None" The idea that if a neuron responds at all it must respond completely.
Reflexes automatic, involuntary reactionswhen sigals do not pass through the brain.
Afferent Neurons convey information from tissue and organs to the brain.
Efferent Neurons Transmit information from the brain to the muscles.
Neurons Fundamental unit of the nervous system, nerve cells.
Neurotransmitters Chemicals in synapse that transmit information between neurons.
Acetycholine Neurotransmitter that activates muscles.
Dopamine Neurotransmitter associated with pleasure system, voluntary movements, emotion.
Norepinehrine Neurotransmitter associated with stress, fight or flight response.
Serotonin Neurotransmitter inhibits anger, aggression, arousal, and sleep.
Created by: felix1585
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