Physiological Quiz 2
The primary difference between an EPSP and an action potential is that ____
EPSPs are subthreshold events that decay over time and space
Increased permeability to which type of ion would most likely result in an IPSP?
Potassium
"Second messengers" carry their messages to ____.
areas within the postsynaptic cell .
Neuropeptides are synthesized in the ____.
cell body
COMT and MAO are ____.
enzymes that convert catecholamines into inactive chemicals
Exocytosis is the process by which neurotransmitters are ____.
released from the presynaptic neuron
What determines whether a neuron has an action potential?
the combined effects of EPSPs and IPSPs
The research that firmly established synaptic communication as chemical was ____.
Loewi's transfer of fluid from stimulated frog hearts
On advantage of nitric oxide is that it ____.
can be made by neurons efficiently
Dopamine and norepinephrine are classified as ____.
catecholamines
The "spontaneous firing rate" of a neuron refers to ____.
its rate of producing action potentials even when it is not stimulated
Receptor molecules for neurotransmitters that exert metabotropic effects are proteins that bind to ____ outside the membrane, and attach to ____ inside the membrane.
neurotransmitters; G-proteins
Ionotropic effects are characterized by ____.
rapid and short-lived effects
What is the proper ordering of a reflex arc?
sensory neuron, interneuron, motor neuron
Hormones exert their effects ____.
similarly to metabotropic neurotransmitters
