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Bio 669 Quiz 2 questions and answers complete solution 100% correct 2024/2025
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Bio 669 Quiz 2 questions and answers complete solution 100% correct 2024/2025
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Bio 669 Quiz 2Neuron is composed of
dendrite, cell body (middle portion of neuron) , axon
densely packed cell bodies (of the neuron, which is middle part) in the CNS are called _____
nuclei
nucleus located in CNS
densely packed cell bodies in the PNS are called _____
Ganglia
What are dendrites?
Receptive portions of the neuron; receives incoming information, senses external stimuli then sends
signal to cell body of the neuron
What do axons do?
Carry impulses away from the cell body to the affector or to another neuron. action potential starts here
because lowest threshold for stimulation
is membrane potential about the inside of the cell or the outside?
inside of the cell
what is an electrochemical gradient?
describes the forces affect on ion movement if allowed to become a permeable membrane
which way the ion moves
when does action potential start?
when a membrane is depolarized enough that it triggers voltage-gated ion channels
What is a graded potential?
changes in membrane potential that decreases over distance
rather the inside is - or +
resting state of the membrane is related to an imbalance of ions, maintained by ion pumps, and a
decrease in?
, permeability Na channells are closing reducing amount of Na availabel to change the inside charge to
allow for depolarization (resting potential) refractory period
polarizatoin or seperation of ions and charges create an electrical potential. ____________ separation
causes polarization and a __________ separation causes depolarization.
increase in separation
decrease in separation (ions are closer together, become stronger and can cause an action potential
through depolarization)
signals are conveyed through this polar
membrane polarization refers to the ____________ of the cell where it is more negative?
the difference is found at the membrane, not the whole cell. what ions cause this difference?
inside ICF, ICF= -
ECF= +
Na, K. Mostly its caused from Na
true or false, not all depolarization leads to an actions potential?
True
the gradient potential may not be able to create enough to self sustain movement which is termed a
local event, depolarization can occur but not lead to an action potential
Action potentials are self sustaining movement of a signal (stimuli) down a membrane.
moving a membrane potential from -70mV to -50mV would be considered depolarization or
polarization?
Depolarization because they are becoming less separated, closer together or less different
the charges are getting closer
if a membrane is deplolarized enough to trigger ______________, an action potential starts. which the
minimum needed for an action potential to occur is called the ____________
voltage gated channels
threshold
(epinephrine and acytelcholine triggers the opening of these channels thus making them more
permeable to Na and K to move in and out.
______________ is a brief/temporary change in membrane potential that will decrease over time. can
be hyperpolarization or depolarization depending on if they are occuring at the same time because of
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