Neurophysiology Flashcards
A chain of neurons is referred to as a _______ whereas a bundle of axons is a _____.
pathway; tract
What are 5 functions of astrocytes?
- support cells
- ion homeostasis
- transmitter uptake
- modulation of synaptic activity
- blood brain barrier
In humans, we have ~ __-__ glial cells per neutron.
4-5
__________ are in the CNS and one ________ can ensheath multiple axons.
oligodendroglia; oligodendrocyte
One _______ cell can ensheath only one axon.
schwann
AP’s are a _______ system.
binary
AP’s are a result of ______ movements.
ion
Excitable membranes have ________ permeability.
selective
APs are a _______ feedback cycle.
positive
________ current = the shuttling of charge along a neuronal process.
passive
_______ current = the movement of ions through ion channels.
active
The velocity of an AP is determined by both _____ and _____ current.
active; passive
_______ = difficulty of moving ions.
resistance
What is resistance measured in?
Ohm
A ________ separates and accumulates charges.
capacitor
In larger axons, is the resistance lower or higher?
lower
In larger axons, is the increased or decreased?
increased
What is an example of an excitatory NT? An inhibitory?
glutamate; GABBA
What is the name given to NT receptors that are associated with ion channels?
inotropic receptors
What is the name given to NT receptors that cause intracellular signalling cascades?
metabotropic receptors
The stretch receptor generates a depolarization that is proportional to the amount of stretch which = _______ ________.
generator potential
What are the slowest types of fibres?
C fibres
