lect 2 Flashcards
input and output from which system
peripheral nervous system
input does what
AFFERENT,
output does what
EFFerent
neurons
excitable, transmittal signal
axon hillock
where choices made on what action to take based on dendrite info
neurons recieve info from where
dendrite
Astrocyte
the support
ion homeostasis
oligodendroglia
myelinationin CNS
can unsheathed multiple axons
shwann cells
myelination in PSN
ensheath one axon
hows excitable membrane different
selective permeability
T/F ions more less concentration to more
F/S more concentration to less
whens equilibrium
balance b/w concentration and electric gradient
nest equation
equilibrium potential of K
Goldman equation
permeability of each ion and concentration gradient
determines resting membrane potentail
Steps in AP
NA channels open NA influx Max pos (Na close) K Efflux Undershoot
active current
movement of ions through ion channels
passive current
shutting charge
voltage of AP determined by
active and passive current
solutions to resistance of AP
increase axon diameter
solution to capacitance
decrease axon diameter (prevents capacity from being reached)
How are fast, show and medium myelinated and size
Fast - large - myelinated
slow - med - unmake
medium - small - myelinated
Node of ranvior purpose
gaps where not myelinated
AP generated here
is AP unidirectional
yes
is AP binary
yes all or nothing
how does AP encode information
temporal spatial summation (keeps hearing same thing thinks its important)
5 things happenings at synapse
AP, CA opens, CA influx, open ION channels, AP
is EPSP an AP
NOOOO
most important neurotransmitter
glutamate
what do excitatory postsynaptic potentials do
moe neuron closer to threshold
what do inhibitory post synaptic potentials do
move neutron away from threshold
where are neurotransmitter released
at chemical synapse
T/F neurotransmitter can result in excitatory or inhibitory signal
true
whats quickest and slowest
motor to skeletal mm slowest is Pain C
