PSYC 3510 LATEST UPDATE 2024 EXAM 1/
ACTUAL EXAM QUESTIONS WITH CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
GRADED A+
What is neuroscience? - Correct Answer - the study of the nervous system and behavior
What is behavioral neuroscience? - Correct Answer - the study of relationships between
behavior and the body, particularly the brain
This difference in electrical charge is referred to as a - Correct Answer - voltage
resting potential - Correct Answer - -The resting potential is the difference in charge
between the inside and outside of the membrane of a neuron at rest.
-Between -40 and -80 mV in different neurons
A typical neuron's resting potential is around - Correct Answer - -70 mV
resting potential caused by - Correct Answer - -unequal distribution of ions on either
side of the membrane
-Outside contains mostly sodium (Na+) and chloride (Cl-) ions
-Inside contains mostly potassium (K+) ions and organic anions (A-)
sodium potassium pump - Correct Answer - Moves 3 Na+ outside for every 2 K+ inside
-Large protein molecules that move sodium ions through the neuron membrane to the
outside and potassium ions back inside, helping to maintain the resting potential.
pg. 1
,force of diffusion - Correct Answer - Ions flow from high to low concentration
-The pressure exerted by ions from an area of greater concentration to an area where
they are less concentrated.
electrostatic pressure - Correct Answer - Ions attracted to the opposite charge (+ to -),
and repelled by the same charge (+ from +)
-The force by which like-charged ions are repelled by each other and opposite-charged
ions are attracted to each other.
excitatory signals - Correct Answer - causes a change in ion balance, which spreads to
adjacent membrane
spreading diminishes over distance - Correct Answer - so it is often referred to as a local
potential
if depolarization reaches threshold - Correct Answer - (around -60 mV), an action
potential will be triggered
ligand bindings - Correct Answer - causes a change in ion balance, which spreads to
adjacent membrane
the local potential is a - Correct Answer - -graded potential: changes in membrane
potential that vary in size, as opposed to being all-or-none. They arise from the
summation of the individual actions of ligand-gated ion channel proteins, and decrease
over time and space
-varies in magnitude with stimulus strength
-is decremental
decremental - Correct Answer - magnitude decreases with distance
pg. 2
,the inside of the neuron is relatively poor in ___ ions and rich in ___ ions - Correct
Answer - sodium, potassium
the rate law - Correct Answer - explains how the intensity of stimuli is represented
Without the sodium-potassium pump, the neuron would become - Correct Answer -
overfilled with sodium ions and unable to fire
there is a limit to how rapidly a neuron can produce action potentials. This is due to -
Correct Answer - the absolute refractory period
saltatory conduction results in - Correct Answer - greater speed with the use of less
energy
general anesthetics open potassium channels, allowing potassium ions to leak out of
the neuron. This - Correct Answer - hyper polarizes the neuron, preventing firing
when the action potential arrives at the terminal button, entry of ___ ions stimulates
release of transmitter - Correct Answer - calcium
all the following neurotransmitters are deactivated by the reuptake except - Correct
Answer - acetylcholine
an inhibitory neurotransmitter causes the inside of the post synaptic neuron to become -
Correct Answer - more negative
excitatory postsynaptic potentials are typically produced by movement of ___ ions,
whereas inhibitory postsynaptic potentials are typically produced by movement of ___
ions - Correct Answer - sodium, potassium or chloride
which of the following is not an example of regulation of synaptic activity? - Correct
Answer - a presynaptic neuron inhibits a postsynaptic neuron
pg. 3
, the presence of synapses in a neuron chain provides the opportunity for - Correct
Answer - modification of neural activity
groups of cell bodies in the CNS are called - Correct Answer - nuclei
the prefontrol cortex is involved in all but which one of the following functions? - Correct
Answer - orienting the body in space
the action potential follows the - Correct Answer - -all or none law
-always occurs at full strength or not at all
-is nondecremental
nondecremental - Correct Answer - message travels over long distances at the same
amplitude
-A property of the action potential, which travels through the neuron without any
decrease in size
Inactivated sodium channels create an - Correct Answer - absolute refractory period
neurons cannot generate another impulse - Correct Answer - Limits frequency of firing
Action potential is only forward moving
open potassium channels create a - Correct Answer - relative refractory period
action potential generated - Correct Answer - only in response to stronger-than-
threshold stimulus
pg. 4
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