Exam (elaborations)
Electrophysiology Exam 1 Questions and Answers (Latest Update 2025)
- Course
- Institution
Electrophysiology Exam 1 Questions and Answers (Latest Update 2025)
[Show more]
Content preview
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.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Allivia. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
72042 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now
