CCI CRAT EXAM SCRIPT 2025/2026 QUESTIONS WITH
ANSWERS MARKED A+
✔✔What is a t-wave and what does it represent in a heart beat? - ✔✔A "normally"
modest positive (upward) waveform.
Indicates ventricular repolarization.
✔✔What is a U-wave? - ✔✔Follows the t-wave.
Represents recovery of the Purkinje fibers.
Important: May not be observable on an EKG tracing.
✔✔The "Zoll Way" to assist with Rhythm interpretation (REMEMBER TO HELP WITH
INTERPRETATION ON THE EXAM): - ✔✔Rhythm
Rate
P Wave
PR Interval
QRS Interval
T Wave
✔✔How many chambers does the heart have? - ✔✔Four (4).
✔✔The _________________ are the receiving chambers of the heart. - ✔✔Atria
(Singular: Atrium)
✔✔The _______________ are the pumping chambers of the heart. - ✔✔Ventricles
(Singular: Ventricle)
✔✔What separates the heart into left and right ventricles? - ✔✔The Septum
✔✔On an EKG tracing, what represents atrial depolarization? - ✔✔The P-wave
✔✔On an EKG tracing, what represents ventricular depolarization? - ✔✔The QRS
complex
✔✔On an EKG tracing, what represents ventricular repolarization? - ✔✔The T-wave
✔✔From start to finish in the electrical conduction system of the heart, name the main
components: - ✔✔Sino-atrial node, Atrioventricular node, Bundle of HIS, Right and Left
Bundle Branches, and finally the Purkinje Fibers.
, ✔✔What are the four sinus rhythms? - ✔✔Normal sinus, Sinus Tachycardia, Sinus
Bradycardia, and Sinus Arrythmia.
✔✔A PAC is a beat that occurs ______________ in the cardiac cycle. -
✔✔premature/early.
✔✔A PAC originates from a site in the ________ other than the SA Node. - ✔✔Atria
✔✔The P-wave of atrial flutter is _________________ shaped. - ✔✔sawtooth
✔✔The innermost layer of the heart wall is called the _____________________. -
✔✔Endocardium
✔✔Of the four chambers in the heart, which receives blood returning from the
pulmonary circulation? - ✔✔Left atrium
✔✔Which chamber of the heart normally has the thickest myocardium? - ✔✔Left
ventricle
✔✔The mitral and tricuspid valves are also known as _________________________. -
✔✔Atrioventricular valves.
✔✔_______________________________ separates the heart into right and left
ventricles. - ✔✔Interventricular septum.
✔✔The "top" chambers of the heart are called the _______________________. -
✔✔Atria (Singular: Atrium)
✔✔What is cardiac "depolarization?" - ✔✔Electrical discharge causing cardiac
contraction.
✔✔Which site is normally the pacemaker of the heart? - ✔✔Sinoatrial node (SA node)
✔✔What is cardiac "repolarization?" - ✔✔The return of ions back to a normal state of
rest.
✔✔Each large horizontal square on the EKG paper represents ____________ seconds.
- ✔✔0.20
✔✔Each small horizontal square on the ECG graph paper represents ___________
seconds. - ✔✔0.04
✔✔The p-wave represents _________________ - ✔✔atrial depolarization
ANSWERS MARKED A+
✔✔What is a t-wave and what does it represent in a heart beat? - ✔✔A "normally"
modest positive (upward) waveform.
Indicates ventricular repolarization.
✔✔What is a U-wave? - ✔✔Follows the t-wave.
Represents recovery of the Purkinje fibers.
Important: May not be observable on an EKG tracing.
✔✔The "Zoll Way" to assist with Rhythm interpretation (REMEMBER TO HELP WITH
INTERPRETATION ON THE EXAM): - ✔✔Rhythm
Rate
P Wave
PR Interval
QRS Interval
T Wave
✔✔How many chambers does the heart have? - ✔✔Four (4).
✔✔The _________________ are the receiving chambers of the heart. - ✔✔Atria
(Singular: Atrium)
✔✔The _______________ are the pumping chambers of the heart. - ✔✔Ventricles
(Singular: Ventricle)
✔✔What separates the heart into left and right ventricles? - ✔✔The Septum
✔✔On an EKG tracing, what represents atrial depolarization? - ✔✔The P-wave
✔✔On an EKG tracing, what represents ventricular depolarization? - ✔✔The QRS
complex
✔✔On an EKG tracing, what represents ventricular repolarization? - ✔✔The T-wave
✔✔From start to finish in the electrical conduction system of the heart, name the main
components: - ✔✔Sino-atrial node, Atrioventricular node, Bundle of HIS, Right and Left
Bundle Branches, and finally the Purkinje Fibers.
, ✔✔What are the four sinus rhythms? - ✔✔Normal sinus, Sinus Tachycardia, Sinus
Bradycardia, and Sinus Arrythmia.
✔✔A PAC is a beat that occurs ______________ in the cardiac cycle. -
✔✔premature/early.
✔✔A PAC originates from a site in the ________ other than the SA Node. - ✔✔Atria
✔✔The P-wave of atrial flutter is _________________ shaped. - ✔✔sawtooth
✔✔The innermost layer of the heart wall is called the _____________________. -
✔✔Endocardium
✔✔Of the four chambers in the heart, which receives blood returning from the
pulmonary circulation? - ✔✔Left atrium
✔✔Which chamber of the heart normally has the thickest myocardium? - ✔✔Left
ventricle
✔✔The mitral and tricuspid valves are also known as _________________________. -
✔✔Atrioventricular valves.
✔✔_______________________________ separates the heart into right and left
ventricles. - ✔✔Interventricular septum.
✔✔The "top" chambers of the heart are called the _______________________. -
✔✔Atria (Singular: Atrium)
✔✔What is cardiac "depolarization?" - ✔✔Electrical discharge causing cardiac
contraction.
✔✔Which site is normally the pacemaker of the heart? - ✔✔Sinoatrial node (SA node)
✔✔What is cardiac "repolarization?" - ✔✔The return of ions back to a normal state of
rest.
✔✔Each large horizontal square on the EKG paper represents ____________ seconds.
- ✔✔0.20
✔✔Each small horizontal square on the ECG graph paper represents ___________
seconds. - ✔✔0.04
✔✔The p-wave represents _________________ - ✔✔atrial depolarization
