NBCE Part 1 Chiro Exam Prep practice questions and answers 2026. Tap an option to test yourself — you'll see the correct answer and a plain-English explanation for every question. Free, no login.
Q1Which of the following cardiac valves is located between the left atrium and left ventricle?
✓ Correct answer: D. Mitral valve
The mitral (bicuspid) valve is located between the left atrium and left ventricle, controlling blood flow between these two chambers during the cardiac cycle.
Q2Which structure forms the anatomical boundary between the right and left ventricles of the heart?
✓ Correct answer: C. Interventricular septum
The interventricular septum is the muscular wall that separates the right and left ventricles of the heart, preventing mixing of oxygenated and deoxygenated blood.
Q3Which of the following vessels carries oxygenated blood from the heart to the systemic circulation?
✓ Correct answer: B. Aorta
The aorta is the main artery that carries oxygenated blood from the left ventricle of the heart to the systemic circulation for distribution throughout the body.
Q4Which layer of the heart wall contains cardiac muscle cells?
✓ Correct answer: A. Myocardium
The myocardium is the middle and thickest layer of the heart wall, consisting primarily of cardiac muscle cells that contract to pump blood through the circulatory system.
Q5Which of the following is NOT a chamber of the heart?
✓ Correct answer: D. Ventriculum
The ventriculum is not a chamber of the heart. The heart consists of four chambers: right atrium, right ventricle, left atrium, and left ventricle.
Q6Which of the following vessels returns deoxygenated blood from the lower body to the heart?
✓ Correct answer: C. Inferior vena cava
The inferior vena cava is the large vein that carries deoxygenated blood from the lower half of the body back to the right atrium of the heart.
Q7Which of the following structures is the primary site of lymphocyte production?
✓ Correct answer: B. Bone marrow
Bone marrow is the primary site of lymphocyte production, including both B lymphocytes and the precursors of T lymphocytes (which later mature in the thymus).
Q8Which part of the lymphatic system is responsible for T-lymphocyte maturation?
✓ Correct answer: A. Thymus
The thymus is the primary lymphoid organ where T-lymphocytes mature and develop immunocompetence before being released into the circulation.
Q9Which of the following best describes the histological structure of an artery wall?
✓ Correct answer: D. Tunica intima, tunica media, tunica adventitia
The wall of an artery consists of three distinct layers: tunica intima (innermost, endothelium and connective tissue), tunica media (middle, smooth muscle and elastic fibers), and tunica adventitia (outermost, connective tissue).
Q10Which of the following structures contribute to the cardiac skeleton?
✓ Correct answer: C. Fibrous rings around heart valves
The fibrous rings (annuli fibrosi) surrounding the heart valves form the cardiac skeleton, providing structural support and electrical isolation between atria and ventricles.
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Theory