NOVA- Anesthesiology ECG Exam 1 (New
2026/ 2027 Update) Questions & Answers
{Grade A} 100% Correct (Verified
Solutions)
What change in the ECG is particularly seen in NSTEMI? - Correct answer ST
depression
Inferior infarction is most likely caused by the occlusion of which coronary artery? -
Correct answer Right main coronary artery
In an acute STEMI, which is usually the first ECG change to appear? - Correct answer T
wave peaking
What ion is responsible for myocardial cell action potentials? - Correct answer K+ (K+
leak channels)
What channel is responsible for phase 0 (rapid depolarization) during a myocardial cell
action potential? - Correct answer Voltage-gated Na+ channels
-they remain open until threshold is reached
,What channel is responsible for phase 1 (slight repolarization) during a myocardial cell
action potential? - Correct answer Transient K+ channels (K+ exits slowly)
What channel is responsible for phase 2 (plateau) during a myocardial cell action
potential?
-this ion prolongs the action potential to keep the cell depolarized - Correct answer
Ca2+ channel (Ca2+ enters)
What channel is responsible for phase 3 (rapid repolarization) during a myocardial cell
action potential? - Correct answer K+ channel (K+ efflux)
What kind of cells lack a true resting membrane potential? - Correct answer
Pacemaker cells
What channel is responsible for phase 4 (slow depolarization) during a pacemaker cell
action potential? - Correct answer Na+
-sodium leaks into the cell until threshold is reached
, -hyperpolarization- activated Na+ channels promote immediate depolarization
(pacemaker potential)
When Na+ leaks into the cell during slow depolarization (4) of a pacemaker cell action
potential, hyperpolarization- activated Na+ channels promote immediate
depolarization. What is this phenomenon? - Correct answer Pacemaker potential
What channel is responsible for phase 0 (rapid depolarization) during a pacemaker cell
action potential? - Correct answer Ca2+ (INFLUX OF CA2+ NOT NA+)
What channel is responsible for phase 3 (repolarization) during a pacemaker cell
action potential? - Correct answer K+ (K+ efflux)
Dominant pacemaker cells reside in the _______ located in the right atrium - Correct
answer SA node
What is the order of signal conduction? - Correct answer SA node
Atrial conducting system/ Bachmann's bundle
2026/ 2027 Update) Questions & Answers
{Grade A} 100% Correct (Verified
Solutions)
What change in the ECG is particularly seen in NSTEMI? - Correct answer ST
depression
Inferior infarction is most likely caused by the occlusion of which coronary artery? -
Correct answer Right main coronary artery
In an acute STEMI, which is usually the first ECG change to appear? - Correct answer T
wave peaking
What ion is responsible for myocardial cell action potentials? - Correct answer K+ (K+
leak channels)
What channel is responsible for phase 0 (rapid depolarization) during a myocardial cell
action potential? - Correct answer Voltage-gated Na+ channels
-they remain open until threshold is reached
,What channel is responsible for phase 1 (slight repolarization) during a myocardial cell
action potential? - Correct answer Transient K+ channels (K+ exits slowly)
What channel is responsible for phase 2 (plateau) during a myocardial cell action
potential?
-this ion prolongs the action potential to keep the cell depolarized - Correct answer
Ca2+ channel (Ca2+ enters)
What channel is responsible for phase 3 (rapid repolarization) during a myocardial cell
action potential? - Correct answer K+ channel (K+ efflux)
What kind of cells lack a true resting membrane potential? - Correct answer
Pacemaker cells
What channel is responsible for phase 4 (slow depolarization) during a pacemaker cell
action potential? - Correct answer Na+
-sodium leaks into the cell until threshold is reached
, -hyperpolarization- activated Na+ channels promote immediate depolarization
(pacemaker potential)
When Na+ leaks into the cell during slow depolarization (4) of a pacemaker cell action
potential, hyperpolarization- activated Na+ channels promote immediate
depolarization. What is this phenomenon? - Correct answer Pacemaker potential
What channel is responsible for phase 0 (rapid depolarization) during a pacemaker cell
action potential? - Correct answer Ca2+ (INFLUX OF CA2+ NOT NA+)
What channel is responsible for phase 3 (repolarization) during a pacemaker cell
action potential? - Correct answer K+ (K+ efflux)
Dominant pacemaker cells reside in the _______ located in the right atrium - Correct
answer SA node
What is the order of signal conduction? - Correct answer SA node
Atrial conducting system/ Bachmann's bundle
