tulphone Flashcards
(18 cards)
cord-like groups of fibers in the center of your nerve.
Axon
is the initial increase of the membrane potential to the value of the threshold potential.
Hypopolarization
branches that carry electrical impulses.
Dendrites
During _______________ the inside of the cell becomes more and more electropositive, until the potential gets closer the electrochemical equilibrium for sodium of +61 mV.
Depolarization
A layer of connective tissue surrounding axons
Endoneurium
whose purpose is to restore the resting membrane potential.
Repolarization
a layer of connective tissue that surrounds groups of axons called fascicles.
Perineurium
is the time after an action potential is generated during which the excitable cell cannot produce another action potential.
Refractory period
a layer of connective tissue that covers the outer surface of your nerve. In your brain cells called oligodendrocytes surround axons
Epineurium
surrounds the axons in a layered sheath (coating).
Myelin
overlaps the depolarization and around 2/3 of repolarization phase.
Absolute refractoriness
cannot cause an action potential.
Subthreshold stimuli
is the period when the generation of a new action potential is possible but only upon a suprathreshold stimulus.
Relative refractoriness
are of enough energy or potential to produce an action potential (nerve impulse)
Threshold stimuli
In humans synapses are chemical, meaning that the nerve impulse is transmitted from the axon ending to the target tissue by the chemical substances called neurotransmitters
Neurotransmitters
also produce an action potential but their strength is higher than threshold
Suprathreshold stimuli
membrane of the terminal button of the nerve fiber
Presynaptic membrane
membrane of the target cell
Post synaptic membrane
