Chapter 4 Flashcards
The wave of absolute refractoriness that follows an action potential
keeps the action potential from spreading actively back down an axon towards the cell body
A change in the resting potential of a dendrite from -70 mV to -72 mV is called
an IPSP
Drugs that facilitate or enhance the effects of a particular neurotransmitter are called - of that neurotransmitter
agonists
What is the most prevalent excitatory neurotransmitter in the CNS?
glutamate
Action potentials can be conducted
actively, passively, orthodromically, and antidromically
Hyperpolarization is to depolarization as
inhibitory is to excitatory
Once released, neurotransmitter molecules typically produce signals in postsynaptic neurons by
binding to postsynaptic receptors
Many neurons contains and release two neurotransmitters. This situation is called
coexistence
What is an example of a non-monoamine neurotransmitter?
acetylcholine
Ions pass through the neural membrane via specialized pores called
ion channels
When a small-molecule transmitter molecule binds to an ionotropic receptor, the
associated ion channel opens or closes
Gap junctions are also called
electrical synapses
Metabotropic receptors are linked to
signal proteins and G proteins
There are three kinds of spatial summation and
two kinds of temporal summation
A neuron normally fires when
the degree of depolarization on the axon adjacent to the hillock exceeds the threshold of activity
