Neurophysio 2 Flashcards
___ often act on neurons
toxins
toxins can either be ___ or ____ to different in channels
agonist
antagonists
tetrodotoxin blocks ____ gated ____ channels
Na+
TTX blocks ___ ___
action potentials
TTX causes ____ or ____
death
paralysis
Botulinum toxin blocks ___ ___ at the neuromuscular junction
vesicle fusion
Botulinum blocks the muscles from ____ reducing wrinkles
contracting
Apamin is a toxin in ___ venom
bee
Apamin blocks a certain type of ___ channel
K+
Curare is in south american plants and used to make ___ tipped darts and arrows
poison
Curare blocks ___ receptors leading to ___ ___
nicotinic
muscle weakness
apamin keeps the __ channels from opening leading to no ____
K+
repolarization
graded responses are ___
electrotonic
2 types of graded responses
EPSP
IPSP
EPSPs are mediated by ___ influx
Na+
IPSPs are mediated by ___ influx
Cl-
specific neurotransmitters to specific neurons?
lock and key receptor specificity
ligand mediated receptors:
ionotropic binding?
ligand binds
channels open
ions flow in/out
ionotropic binding is ____
fast
metabotropic binding
bind to neurotransmitter and doesnt open
G protein activated by neurotransmitter
talks to nucleus
metabotropic is ___
slow
___ is the most prevalent excitatory neurotransmitter
glutamate
3 ionotropic glutamate NTs
AMPA
Kainate
NMDA
AMPA causes a ___ influx
Na+
NMDA requires ___, some Mg2+ and then ___ and ___ influx in addition to glutamate binding
depolarization
Na+
Ca2+
metabotropic glutamate NT
MGLURs
glutamate can be ____
excitoxic
exitoxic
neuron explodes on itself
___ is the most prevalent inhibitory NT
GABA