BIO 669 QUIZ 2 QUESTIONS AND ANSWERS | WITH COMPLETE SOLUTION 2025/25 RATED A+
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Course
BIO 669.
Institution
BIO 669.
Neuron is composed of
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dendrite, cell body (middle portion of neuron) , axon
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densely packed cell bodies (of the neuron, which is middle part) in the CNS are called
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nuclei
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...
dendrite, cell body (middle portion of neuron) , axon ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
densely packed cell bodies (of the neuron, which is middle part) in the CNS are called
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nuclei
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nucleus located in CNS ii ii ii ii ii ii ii ii ii
densely packed cell bodies in the PNS are called
Ganglia ii ii
What are dendrites? ii ii ii ii ii ii ii ii ii ii
Receptive portions of the neuron; receives incoming information, senses external stimuli
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then sends signal to cell body of the neuron
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What do axons do? ii ii ii ii ii ii ii ii ii ii ii ii ii ii
Carry impulses away from the cell body to the affector or to another neuron. action
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potential starts here because lowest threshold for stimulation
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is membrane potential about the inside of the cell or the outside?
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inside of the cell ii ii ii ii
what is an electrochemical gradient? ii ii ii ii ii ii ii ii ii ii ii ii ii
describes the forces affect on ion movement if allowed to become a permeable membrane
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which way the ion moves ii ii ii ii
when does action potential start? ii ii ii ii ii ii ii ii ii ii ii
when a membrane is depolarized enough that it triggers voltage-gated ion channels
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What is a graded potential? ii ii ii ii ii ii ii
changes in membrane potential that decreases over distance
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rather the inside is - or + ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
resting state of the membrane is related to an imbalance of ions, maintained by ion pumps,
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and a decrease in? ii ii ii ii ii ii ii ii ii ii ii ii
permeability Na channells are closing reducing amount of Na availabel to change the
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inside charge to allow for depolarization (resting potential) refractory period ii ii ii ii ii ii ii ii ii ii
polarizatoin or seperation of ions and charges create an electrical potential.
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separation causes polarization and a separation causes
depolarization. ii ii
increase in separation
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decrease in separation (ions are closer together, become stronger and can cause an
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action potential through depolarization)
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signals are conveyed through this polar
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membrane polarization refers to the of the cell where it is more negative?
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the difference is found at the membrane, not the whole cell. what ions cause this
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difference? ii ii ii
inside ICF, ICF= - ii
ECF= +
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Na, K. Mostly its caused from Na
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true or false, not all depolarization leads to an actions potential?
True ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
the gradient potential may not be able to create enough to self sustain movement which is
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termed a local event, depolarization can occur but not lead to an action potential
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Action potentials are self sustaining movement of a signal (stimuli) down a membrane.
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moving a membrane potential from -70mV to -50mV would be considered depolarization or
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polarization? ii ii ii ii ii ii ii ii ii ii ii
Depolarization because they are becoming less separated, closer together or less different
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the charges are getting closer
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if a membrane is deplolarized enough to trigger
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, an action potential ii ii ii ii ii ii ii ii ii ii ii ii
starts. which the minimum needed for an action potential to occur is called the
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voltage gated channels
threshold
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(epinephrine and acytelcholine triggers the opening of these channels thus making them
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more permeable to Na and K to move in and out. ii ii ii ii ii ii ii ii ii ii
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is a brief/temporary change in membrane potential that will decrease
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over time. can be hyperpolarization or depolarization depending on if they are occuring at
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the same time because of this occurs they will cancel each other out. (magnitude variant).
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Ion channels can open by chemical influence (epi, acetylcholine ) or by electrical potentials
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graded potentials ii ii ii ii ii ii ii ii ii ii ii ii ii ii
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look alike, they are all or none events, proceed the same way , proceed
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without decrement (not diminishing over time) and followed by a refractory period?
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Action potential ii ii ii ii ii ii ii ii ii ii ii ii ii
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is when the membrane rests after so many action potentials , needs to
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reset, and at his point, is unable to create another action potential?
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is when the membrane can generate an action potential but is very
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difficult to do so, is some opening of the K gates where it can be too hyperpolarized.
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absolute refractory period
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relative refractory period
usually ii
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