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Psych100

Chapter 5 - Biological Foundations

TermDefinition
Dendrite Receive impulses from other nerve cells
Soma Contains the genetic instructions for the function of the cell
Axon Carries the cell's impulse through its length
Terminal Spreads the cell's impulse out to reach other neurons
Axon Hillock Joins the soma and axon to collect the impulses before sending one down the cell
Schwann Cell/ Myelin Sheath Surrounds some neurons to increase how efficiently it can carry an impulse
Action Potential Electrical impulse that tells the cell to communicate with another neuron Caused by the flow of negative and positive ions in and outof the neuron
Depolarization Stimulus causes Sodium ions flood into the cell, reducing the resting potential
Action Potential http://people.eku.edu/ritchisong/301notes2.htm
Absolute Refractory Period During an action potential, No second AP is able to be produced no matter how strong the stimulus
Relative Refractory Period Another AP can be produced only if the stimulus is greater than the threshold stimulus
Synapse Point of impulse transmission between neurons
Excitatory Neurotransmitters Neurotransmitters that make the membrane potential less negative - stimulate the postysynaptic membrane
Inhibitory Neurotransmitters Neurotransmitters that make the membrane potential more negative - inhibit the transmission of an impulse
Temporal Summation Transmission of an impulse by rapid stimulation of one or more presynaptic neurons
Spatial summation Transmission of an impulse by simultaneous or nearly simultaneous stimulation of two or more presynaptic neurons
CONTINUE WITH THE NERVOUS SYSTEM
Created by: ybekele
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