Create an account
The nervous system employs exclusively electrical means to send messages, whereas the endocrine system communicates by means of chemical messengers.
In a myelinated fiber only the initial segment in the trigger zone have voltage-regulated channels.
Acetylcholine triggers the synthesis of the second messenger cAMP only in neurons of the PNS.
Some ___ neurons are specialized to detect stimuli, whereas ____ neurons send signals to the effectors of the nervous system.
the soma and at least some neurilemma intact.
In order for a peripheral nerve fiber to regenerate it must have
inflow of chloride
Which of the following will cause the plasma membrane to hyperpolarize when at its RMP?
Local potentials are _____, meaning they vary in magnitude according to the strength of the stimulus.
When the voltage of a plasma membrane shifts from +35mV towards 0 mV, we say the cell is
no stimulus of any strength will trigger a new action potential.
During the absolute refractory period
There are no internodes in unmyelinated fibers.
What would be the best explanation for why myelinated fibers conduct signals faster than unmyelinated fibers?
they are released into the bloodstream before reaching the postsynaptic cell.
All of the following are typical characteristics of neurotransmitters except
-aminobutyric acid (GABA)
___ binds to ligand-regulated gates, and is the most common inhibitory neurotransmitter in the brain.
synaptic vesicles release ACh
Which of these happens first in an cholinergic synaptic transmission?
G protein dissociates from the NE receptor
Which of these happens first in an adrenergic synaptic transmission?
that breaks down monoamines.
Some antidepressant drugs act by inhibiting monoamine oxidase (MAO), which is an enzyme
synaptic vesicles secrete neurotransmitter by exocytosis
All of these contribute to the cessation of the signal in a synaptic transmission except
hyperpolarization of the cell membrane.
Inhibitory postsynaptic potentials (IPSPs) are associated with
a voltage change from -70 mV to -69.5 mV
Which of these is an example of an EPSP in a typical neuron?
A neuron can receive thousands of EPSPs from different neurons, and responds by triggering or not triggering an action potential. This addition and response to the net effect of postsynaptic potentials is called
Even though all action potentials are the same, the brain can differentiate a variety of stimuli by source and intensity. The mechanism by which the nervous system converts these action potentials into meaningful information is called neural
Parkinson disease is a progressive loss of motor function due to the degeneration of specific neurons. These neurons secrete an inhibitory neurotransmitter that prevents excessive activity in motor centers of the brain. This neurotransmitter is
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together