action potential Flashcards
what is the resting membrane potential for a muscle
-85-90mv
what is the resting membrane potential for a neuron
-65-70mv
what is the membrane potential on the inside
negative
what is the membrane potential on the outside
positive
what makes the inside membrane potential negative
large proteins
what makes the outside membrane potential positive
sodium
what do receptors do
all sodium to leak into the cell, towards depolarization of nerve for action potential
what is deplorization
sodium rushing in
what is occurring during the ascending limb
sodium leaking in towards “sodium equilibrium point” from receptor stimulation
dorsal column receptor for vibration
pacinion
dorsal column receptor for joint position in space
ruffini
dorsal column receptors for accurate touch
meissners/merkels
what senses pain, temperature and crude touch
spinothalamic tracts free naked endings
when does threshold occur
enough Na+ leaks in for any portion of inner membrane to be +=
SPONTANEOUS DEPOLARIZATION
“ALL OR NOTHING PRINCIPLE”
what occurs during the descending limb
potassium moves out of cell
REPOLARIZATION
ABSOLUTE REFRACTORY PERIOD
what are the aka’s for subnormal period
hyperpolarized
relative refractory period
(more negative, harder to fire the nerve)
what occurs during the sodium/potassium pump
3sodium out
2 potassium in
minimum current for action potential
rheobase
time, using 2x rheobase for action potential
chronaxie
inhibitory post-synaptic potential
Cl-rushes in, may also open K+ channels more to leak out K+
what is the inhibitory neurotransmitter of the spine
glycine
what is the inhibitory neurotransmitter of the brain
GABA
