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Electrophysiology Exam 1 Questions and Answers (Latest Update 2025)
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Electrophysiology Exam 1 Questions and Answers (Latest Update 2025)
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Electrophysiology Exam 1 Questions andAnswers (Latest Update 2025)
What is electrical charge? How is it transferred? - Correct
Answer ✅ Electrical charge = a property of matter, and the
basis of electromagnetic force or EMF
It is transferred with the exchange of electrons
What are cations and anions? - Correct Answer ✅ Cation -
electron deficient; positive charged atom
Anion - electron excess; negative charged atom
What is Coulomb's law? - Correct Answer ✅ Force exerted
between two charges = Coulomb force
Force, F = (q1 x q2)/r2
How does electrical charge transfer to work done/movement
of charged particles? - Correct Answer ✅ Force of charged
particles is exerted on other charged particles through its
electric field -> potential energy increases -> work is done
and charged particles move
,Electrophysiology Exam 1 Questions and
Answers (Latest Update 2025)
What is voltage? - Correct Answer ✅ Voltage, V = change
in potential energy b/n 2 points in an electric field per unit of
charge, driving charged particle movement
V=J/C
V = EMF
What are conductors, resistors, and insulators? - Correct
Answer ✅ Conductors = substance that allows charged
particles readily move in an electric field/flow freely. E.g.
Human tissue or aqueous body fluids
Resistors = substance that limits electron flow. E.g. ion gates
in a membrane
Insulators = substances that do not tend to allow free
movement of ions or electrons. E.g. myelin sheath around
neurons
What is Ohm's law? - Correct Answer ✅ V=IR
V - voltage, I - current, and R - resistance
In what direction is electron flow and current flow? - Correct
Answer ✅ Electron flow is from negative to positive. Current
,Electrophysiology Exam 1 Questions and
Answers (Latest Update 2025)
flow is from positive to negative (from higher potential energy
to lower potential).
What is current? - Correct Answer ✅ Rate of movement
(flow) of charged particles (electrons) in a conductor
(medium).
Current, or I (Amperes) = Coulomb / second
How can we measure voltage? - Correct Answer ✅ Vprobe -
Vreference
What is resistance? What is it related to? - Correct Answer
✅ Resistance = Opposition to current flow
R (Ohms) = resistivity (ρ) x length / area (CSA)
It is proportionally related to length, and inversely related to
cross sectional area (but length isn't super important bc
conductivity of wire is so high)
What is conductance? - Correct Answer ✅ Ease of
movement of charged particle in a medium
, Electrophysiology Exam 1 Questions and
Answers (Latest Update 2025)
G (Siemans) = 1 / R, resistance
What are the factors that regulate flow of an electrical current
through a biological tissue? - Correct Answer ✅ Resistance
-Affected by length of leads and area of electrodes (more so
area)
-Affected by skin at electrode-skin interface. There is always a
risk of burns! But certain properties increase or decrease
resistance
-If resistors are in series, parallel, or a combination
What are the equations for resistance in series and parallel
circuits? - Correct Answer ✅ Series: Rt = R1 + R2 + R3...
Parallel: 1/Rt = 1/R1 + 1/R2 + 1/R3...
How does current travel through a circuit? What does this
mean for series and parallel circuits? - Correct Answer ✅
Current will take the path of least resistance. This means in a
parallel circuit current can take other pathways, thus overall
resistance is smaller than individual resistances! Series
circuits do not have the option to take another pathway.
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