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BIO 669 Neuro I Exam Questions and Answers
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BIO 669 Neuro I Exam Questions and Answers
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BIO 669 Neuro I Exam Questions andAnswers
3 components of a neuron - Correct Answer ✅cell body/soma,
dendrites, axons
Densely packed cell bodies in the CNS are ______________. -
Correct Answer ✅nuclei
Densely packed cell bodies in the PNS are _____________. - Correct
Answer ✅ganglia
_______________ are the receiving part of the neuron. They receive
incoming signals and send signals to the neuron ____ ________.
They eventually converge into the ___________ ____________. -
Correct Answer ✅Dendrites, cell body, axon hillock
_____________ are able to be affected by external stimuli. - Correct
Answer ✅Dendrites
_________- take the signal to the end of the cell and carry impulses
AWAY from the cell body toward another neuron or effector. -
Correct Answer ✅axons
,BIO 669 Neuro I Exam Questions and
Answers
The ____________ ___________ is a cone-shape where the axon
leaves the cell body. The axon hillock determines whether there is
enough ____________ ______________ _______________ to develop and
sustain an AP to send down the axon hillock. - Correct Answer
✅axon hillock, excitatory graded potentials
As dendrites bring signals into the ___________ ____ _______ some
may be _____________-more likely to generate signal or
____________-prevent signal from being developed. - Correct
Answer ✅neuron cell body, excitatory, inhibitory
The initial segment of the axon is the area of the axon having the
_________ threshold for stimulation, so the AP ________ at this
point. - Correct Answer ✅lowest, begin
During the __________ state, an imbalance of ions is created and
maintained by ion pumps and lack of permeability to ions. -
Correct Answer ✅resting state
The concentration of ions are given in ___. The separation or
_______________ of ions and charges creates an ____________
_____________. Little to no difference in charges between inside
and outside __________________. - Correct Answer ✅mOsm,mM
,BIO 669 Neuro I Exam Questions and
Answers
polarization
electrical potential
depolarization
The __________ __________ refers to the inside of the cell, a -70mV -
the charge associated with the inside of the cell means that the
inside aka the ____________ is more __________ than the
extracellular environment. - Correct Answer ✅membrane
potential, cytoplasm, more negative
The inside of the cell is __________ charged and the outside of the
cell is _____________ charged. The different in charges is found at
the ______________ not the cell as a whole. What ions cause this
difference? - Correct Answer ✅negatively, positively
membrane, K & Na but mostly Na
Which way would K & Na move if left to diffusion and the
membrane were permeable? - Correct Answer ✅High to low if
left solely to diffusion.
IF there is 150 mM Na and 5mM K outside the cell and 15 mM Na
and 150 mM K inside, why would they not diffuse equally fast
, BIO 669 Neuro I Exam Questions and
Answers
across the membrane? - Correct Answer ✅There are two forces
acting on the ions. Iff both Na & K were fully permeable, there
would be a lot more Na move in than K move out bc the 2nd thing
to help drive these ions is the cell charges. Since the inside of the
cell is negative, it lends an additional force to move the Na in and
retain K.
The _____________ ______________ is used to describe the forces
affecting ion movement if allowed to become permeable to a
membrane. ___________ gradients move from high to low
concentration, thus becoming more ___________ aka a _________
energy state. - Correct Answer ✅electrochemical gradient,
Chemical, random, lower energy state
___________ gradients where opposite charges attract, similar
charges repel which can set up a force to move charged particles.
____________ are charges separated by a membrane and are
measured in _______ - Correct Answer ✅Electrical gradients-
where opposite charges attract,
potentials
volts, mV
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