CCT - Certified Cardiographic Technician Cardiovascular Anatomy and Physiology Questions and Answers 1

Question 1

A red blood cell is in the right atrium. Which of the following represents the correct path it will take through the heart's valves to reach the systemic circulation via the aorta?

Accepted Answer

Tricuspid -> Pulmonic -> Mitral -> Aortic

Answer

Deoxygenated blood flows from the right atrium, through the tricuspid valve to the right ventricle, then through the pulmonic valve to the lungs. Oxygenated blood returns to the left atrium, passes through the mitral valve to the left ventricle, and is finally ejected through the aortic valve into the systemic circulation.

Question 2

A patient's ECG shows a complete absence of P waves and a regular, narrow-complex rhythm at a rate of 50 beats per minute. Which structure has most likely taken over as the primary pacemaker of the heart?

Accepted Answer

Atrioventricular (AV) node

Answer

The SA node, the heart's primary pacemaker, normally fires at 60-100 bpm and generates the P wave. Its failure causes a secondary or escape pacemaker to take over. The AV node (or AV junction) has an intrinsic firing rate of 40-60 bpm. When it acts as the pacemaker, it produces a junctional escape rhythm, characterized by a regular, narrow-QRS rhythm without preceding P waves, which matches the scenario. Purkinje fibers have a slower intrinsic rate (20-40 bpm) and produce a wide QRS complex.

Question 3

An ECG shows ST-segment elevation in leads II, III, and aVF, indicating an injury to the inferior wall of the left ventricle. Occlusion of which coronary artery is the most likely cause of this finding?

Accepted Answer

Right Coronary Artery (RCA)

Answer

In approximately 80-90% of individuals (a right-dominant circulation), the Right Coronary Artery (RCA) gives rise to the posterior descending artery, which is the primary blood supply to the inferior wall of the left ventricle. Therefore, an occlusion of the RCA is the most common cause of an inferior wall myocardial infarction, which is visualized by ECG changes in the inferior leads (II, III, and aVF).

Question 4

Which layer of the heart wall is composed of cardiac muscle and is primarily responsible for the heart's pumping action?

Accepted Answer

Myocardium

Answer

The myocardium is the thick, muscular middle layer of the heart wall. Its coordinated contraction (systole) is responsible for the powerful pumping action that ejects blood from the ventricles. The endocardium is the inner lining, the epicardium is the outer layer of the heart wall, and the pericardium is the protective sac surrounding the heart.

Question 5

On a standard ECG tracing, which waveform represents the electrical activation and depolarization of the ventricular myocardium?

Accepted Answer

QRS complex

Answer

The QRS complex represents the rapid depolarization of the right and left ventricles. This large electrical event triggers the mechanical contraction (systole) of the ventricles. The P wave represents atrial depolarization, and the T wave represents ventricular repolarization.

CCT - Certified Cardiographic Technician Exam Practice Test

CCT - Certified Cardiographic Technician Exam Practice Test

CCT - Certified Cardiographic Technician Cardiovascular Anatomy and Physiology Questions and Answers 1