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CBNS 120 Midterm 1 Questions and
Correct Answers/ Latest Update / Already
Graded
Cajal used the [_________] stain to prove the [___________] Doctrine.
Ans: golgi; neuron
Conductance is the reciprocal of:
Ans: resistance
Hyperpolarization occurs when the membrane potential becomes
more [_____________], while depolarization causes the membrane
potential to become more [_______________].
Ans: negative; positive
Permeability indicates the presence of ______, while conductance
requires _______ and ______.
Ans: open channels; ions; permeability
Permeability is the ability of the membrane to conduct _________ .
Ans: ions
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Categories of ion channels include ________, _________, and
_________.
Ans: stretch-activated; voltage-activated; ligand-activated
Conductance can be distinguished from permeability by the
requirement for ___________.
Ans: charge
The membrane potential at which the diffusional force created by an
ion gradient is equal and opposite to the electrical force is called the
[________________].
Ans: equilibrium potential
The difference between the membrane potential (Vm) and the
equilibrium potential (Ex) for any given ion is called [_____________].
Ans: driving force
When current flow across the membrane in one direction exceeds
current flow in the opposite direction, it is called ___________.
Ans: rectification
All rights reserved © 2025/ 2026 |
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Ion channels flux (transfer) ions across the membrane at rates of
a.) 10^7-10^8 ions/sec
b.) 10^3-10^5 ions/sec
c.) 10^2-10^3 ions/sec
d.) 10^9-10^10 ions/sec
Ans: 10^7-10^8 ions/sec
Driving Force is:
a.) equals the difference between the equilibrium potential (Ex) and the
membrane potential (Vm).
b.) zero when the Vm = Ex
c.) is required for current to flow across the membrane
d.) All of the above
Ans: d.) all of the above
Ion channel activity is:
All rights reserved © 2025/ 2026 |
CBNS 120 Midterm 1 Questions and
Correct Answers/ Latest Update / Already
Graded
Cajal used the [_________] stain to prove the [___________] Doctrine.
Ans: golgi; neuron
Conductance is the reciprocal of:
Ans: resistance
Hyperpolarization occurs when the membrane potential becomes
more [_____________], while depolarization causes the membrane
potential to become more [_______________].
Ans: negative; positive
Permeability indicates the presence of ______, while conductance
requires _______ and ______.
Ans: open channels; ions; permeability
Permeability is the ability of the membrane to conduct _________ .
Ans: ions
All rights reserved © 2025/ 2026 |
, Page |2
Categories of ion channels include ________, _________, and
_________.
Ans: stretch-activated; voltage-activated; ligand-activated
Conductance can be distinguished from permeability by the
requirement for ___________.
Ans: charge
The membrane potential at which the diffusional force created by an
ion gradient is equal and opposite to the electrical force is called the
[________________].
Ans: equilibrium potential
The difference between the membrane potential (Vm) and the
equilibrium potential (Ex) for any given ion is called [_____________].
Ans: driving force
When current flow across the membrane in one direction exceeds
current flow in the opposite direction, it is called ___________.
Ans: rectification
All rights reserved © 2025/ 2026 |
, Page |3
Ion channels flux (transfer) ions across the membrane at rates of
a.) 10^7-10^8 ions/sec
b.) 10^3-10^5 ions/sec
c.) 10^2-10^3 ions/sec
d.) 10^9-10^10 ions/sec
Ans: 10^7-10^8 ions/sec
Driving Force is:
a.) equals the difference between the equilibrium potential (Ex) and the
membrane potential (Vm).
b.) zero when the Vm = Ex
c.) is required for current to flow across the membrane
d.) All of the above
Ans: d.) all of the above
Ion channel activity is:
All rights reserved © 2025/ 2026 |
