Neuroscience & Neurophysiology Flashcards
where do neurons receive information
dendrites
what is the most dynamic part of the neuro system
dendrites
name the important cells of the nervous system
what are they known for?
astroglia - BBB
support cell, modulation of synaptic activity
Microglia - macrophage
oligodendrocyte- form myelin sheath (CNS)
polydendrocyte- precursor cell
schwaan - myelination in PNS
what type of system are action potentials
binary
0-1
result of ion movements
what is the resting position of K+ and Na+ ions
K+ high on inside & low on inside & Na+ low on inside and high on outside
describe the action potential graph
Na+ influx causes depolarization
K+ outward efflux repolarization
undershoot
what is active current
movement of ions through ion channels
what is passive current
shuttling of charge along a neuronal process
describe the process of action potential to
1) voltage-gated Na+ channels is open and an AP is generated
2) passive current (charge) flows to the next voltage -gated Na+ channels
3) passive current opens the voltage gated Na+ channels and another AP is generated
Resistance
how do we fix this?
difficulty moving ions
increase axon diameter
capacitance
amount of charge accumulated on the membrane
decrease axon diameter
how do we deal with both barriers
increase the axon diameter and myelinate
an AP is
unidirectional
fast
efficient
simple
what is an EPSP?
move a neuron closer to threshold, more positive charge in the area
what is an IPSP
move a neuron farther away from threshold, more negative charge in the area
