Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
27 Cards in this Set
- Front
- Back
|
Corresponds to the period of repolarization of the neuron.
|
Relative Refractory Period
|
|
|
Process by which the resting potential is decreased as sodium ions move into the axon.
|
Depolarization
|
|
|
State of an unstimulated Neuron's membrane
|
Polarized
|
|
|
Period (event) during which potassium ions move out of the axon.
|
Repolarization
|
|
|
Also called the nerve impulse
|
Action Potential
|
|
|
Period when a neuron cannot be restumulated because its sodium gates are open and an AP is being generated.
|
Absolute Refractory Period
|
|
|
Mechanism by which ATP is used to move sodium ions out of the cell and potassium ions into the cell; completely restores and maintains the resting conditions of the neuron.
|
Sodium Potassium Pump
|
|
|
Point at which an axon "fires"
|
Threshold
|
|
|
Term for a weak stimulus
|
Subthreshold
|
|
|
Self propagated depolarization
|
Action Potential
|
|
|
Codes for intensity of the stimulus
|
Frequency of impulses
|
|
|
Membrane potential at which the outward current carried by K+ is exactly equal to the inward current carried by Na+
|
Threshold
|
|
|
A voltage change that reduces the ability of a neuron to conduct an impulse; the membrane potential becomes more negative.
|
Hyperpolarization
|
|
|
A local change in the membrane potential in which current flow is quickly dissipated; that is, decremental.
|
Graded Potential
|
|
|
An all or none electrical event
|
Action Potential
|
|
|
A voltage change that brings a neuron closer to its threshold for firing; the membrane potential becomes less negative and moves towards 0
|
Depolarization
|
|
|
Results from the opening of voltage regulated ionic gates
|
Action Potential
|
|
|
Results from the opening of chemically regulated gates or energetic stimuli
|
Graded potential
|
|
|
Characterized by a rapid polarity reversal
|
Action Potential
|
|
|
Junction or point of close contact between neurons
|
Synapse
|
|
|
Chemicals released by neurons that stimulate other neurons, muscles, or glands.
|
Neurotransmitters
|
|
|
Gaps in a myelin sheath
|
Nodes of Ranvier
|
|
|
Bundle of axons in the CNS
|
Tract
|
|
|
Collection of cell bodies found outside the CNS
|
Ganglion
|
|
|
Collection of cell bodies found within the CNS
|
Nucleus
|
|
|
Changes, occuring inside or outside the body, that activate the nervous system
|
Stimuli
|
|
|
Bundle of axons in the PNS
|
Nerve
|
