AHN 568 MODULE 2 Exam (Latest 2025 Update) Questions and Verified
Answers | 100% Correct | Grade A+
what produces an entire QRS complex on EKG? - ANSWER-depolarization of the
entire ventricular myocardium.
where are the terminal filaments - ANSWER-beneath the endocardium and
spreads outward to the epicardium. but they dont go there. they barely reach the
myocardium. pg 21
-the TF and purkinje fibers lie just beneath the endocardial lining of both
ventricles)
what is Q wave? - ANSWER-First negative deflection following the P wave but
before the R wave. It represents the beginning of ventricular depolarization. May
not be present in all leads and may not been seen on EKG.
what is R wave? - ANSWER-first upward deflection
what is S wave? - ANSWER-any downward wave preceded by an upward wave.
must follow a R
what is a QS wave? - ANSWER-Downward wave with no upward wave at all. cant
tell if it is Q or S. so its called QS
,What does the ST segment represent? - ANSWER-early ventricular repolarization
plateau phase
what happens during T wave? - ANSWER-rapid ventricular repolarization
(myocytes become negative in their normal resting state)
what does repolarization occur? - ANSWER-immediately after QSR, plateau phase
(ST), then rapid phase (T wave).
what ion does repolarization? - ANSWER-K + ions leaving the myocyte
The only electrical conduction pathway btwn atria and ventricle? - ANSWER-AV
NODE
the flat isoelectric line after P wave represents what? - ANSWER-this pause after
electricity its AV node is blood passing through AV valves
slowed conduction via AV node is carried by what ions? - ANSWER-Ca++
,P wave represents what? - ANSWER-atrial depolarization and contraction.
(upward spike is depolarization)
where is SA node? - ANSWER-posterior, upper wall of right atrium
depolarization from SA node is done by what ions? - ANSWER-Na++
positive line on EKG is what? - ANSWER-depolarization wave- myocyte goes from
negative (resting to positive/contracting)
Repolarization begins when? when is it on the EKG? - ANSWER-immediately after
depolarization.
the isoelectric line after S to the T (the ST segment) is initial depolarization.
the T wave is late repolarization
explain electricity of a myocyte- electrical charge? - ANSWER-resting= negative
inside, positive outside.
depolarization makes the inside positive from NA++ causing a contraction
mitraL - ANSWER-left AV valve
tRIcuspid - ANSWER-RIGHT AV valve
, explain ventricular conduction system - ANSWER-immediately starts at BUNDLE OF
HIS which penetrates and comes off the AV node. BIH bifurcates to RIGHT & LEFT
BUNDLE BRANCHES.
both the BIH and LBB and RBB are purkinje fibers.
depolarization in this system happens quickly.
what ion depolarizes the ventricles? - ANSWER-HIS, LBB, RBB (purkinje fibers) are
depolarized quickly by NA++
what is electrically happening during systole? - ANSWER-both depolarization and
repolarization of ventricles occurs during systole. pg 27
systole is measured from BEGINNING OF QRS TO END OF T WAVE
systole is what park on EKG? - ANSWER-systole is measured from BEGINNING OF
QRS TO END OF T WAVE
QT interval is good indicator of what? - ANSWER-repolarization
What is the QTc interval? - ANSWER-QT (interval) corrected for heart rate
Answers | 100% Correct | Grade A+
what produces an entire QRS complex on EKG? - ANSWER-depolarization of the
entire ventricular myocardium.
where are the terminal filaments - ANSWER-beneath the endocardium and
spreads outward to the epicardium. but they dont go there. they barely reach the
myocardium. pg 21
-the TF and purkinje fibers lie just beneath the endocardial lining of both
ventricles)
what is Q wave? - ANSWER-First negative deflection following the P wave but
before the R wave. It represents the beginning of ventricular depolarization. May
not be present in all leads and may not been seen on EKG.
what is R wave? - ANSWER-first upward deflection
what is S wave? - ANSWER-any downward wave preceded by an upward wave.
must follow a R
what is a QS wave? - ANSWER-Downward wave with no upward wave at all. cant
tell if it is Q or S. so its called QS
,What does the ST segment represent? - ANSWER-early ventricular repolarization
plateau phase
what happens during T wave? - ANSWER-rapid ventricular repolarization
(myocytes become negative in their normal resting state)
what does repolarization occur? - ANSWER-immediately after QSR, plateau phase
(ST), then rapid phase (T wave).
what ion does repolarization? - ANSWER-K + ions leaving the myocyte
The only electrical conduction pathway btwn atria and ventricle? - ANSWER-AV
NODE
the flat isoelectric line after P wave represents what? - ANSWER-this pause after
electricity its AV node is blood passing through AV valves
slowed conduction via AV node is carried by what ions? - ANSWER-Ca++
,P wave represents what? - ANSWER-atrial depolarization and contraction.
(upward spike is depolarization)
where is SA node? - ANSWER-posterior, upper wall of right atrium
depolarization from SA node is done by what ions? - ANSWER-Na++
positive line on EKG is what? - ANSWER-depolarization wave- myocyte goes from
negative (resting to positive/contracting)
Repolarization begins when? when is it on the EKG? - ANSWER-immediately after
depolarization.
the isoelectric line after S to the T (the ST segment) is initial depolarization.
the T wave is late repolarization
explain electricity of a myocyte- electrical charge? - ANSWER-resting= negative
inside, positive outside.
depolarization makes the inside positive from NA++ causing a contraction
mitraL - ANSWER-left AV valve
tRIcuspid - ANSWER-RIGHT AV valve
, explain ventricular conduction system - ANSWER-immediately starts at BUNDLE OF
HIS which penetrates and comes off the AV node. BIH bifurcates to RIGHT & LEFT
BUNDLE BRANCHES.
both the BIH and LBB and RBB are purkinje fibers.
depolarization in this system happens quickly.
what ion depolarizes the ventricles? - ANSWER-HIS, LBB, RBB (purkinje fibers) are
depolarized quickly by NA++
what is electrically happening during systole? - ANSWER-both depolarization and
repolarization of ventricles occurs during systole. pg 27
systole is measured from BEGINNING OF QRS TO END OF T WAVE
systole is what park on EKG? - ANSWER-systole is measured from BEGINNING OF
QRS TO END OF T WAVE
QT interval is good indicator of what? - ANSWER-repolarization
What is the QTc interval? - ANSWER-QT (interval) corrected for heart rate
