NBCE Part 1 Chiro Exam Prep Exam Questions & Answers 2026 (11–20)

Question 1

What is the embryonic structure that gives rise to the heart?

TheoryPractice · Accepted Answer

Cardiac tube. The cardiac tube, formed from paired endocardial tubes that fuse in the midline during embryonic development, gives rise to the primitive heart and undergoes folding and septation to form the four-chambered heart.

Question 2

Which of the following statements best describes the pericardium?

TheoryPractice · Accepted Answer

A double-walled sac with visceral and parietal layers. The pericardium is a double-walled sac that surrounds the heart, with the visceral layer (epicardium) adhering to the heart surface and the parietal layer forming the outer sac, with pericardial fluid in between.

Question 3

Which coronary artery typically supplies the sinoatrial (SA) node?

TheoryPractice · Accepted Answer

Right coronary artery. The right coronary artery typically supplies the sinoatrial node (in about 60-70% of people), which is the primary pacemaker of the heart located in the right atrial wall.

Question 4

What is the primary function of the lymphatic vessels?

TheoryPractice · Accepted Answer

To collect excess interstitial fluid and return it to the blood. The primary function of lymphatic vessels is to collect excess interstitial fluid from tissues and return it to the blood circulation, helping maintain fluid balance in the body.

Question 5

Which of the following is NOT a normal component of the conducting system of the heart?

TheoryPractice · Accepted Answer

Stellate ganglion. The stellate ganglion is not part of the heart's conducting system. It is a sympathetic ganglion in the neck that provides sympathetic innervation to the heart. The conducting system includes the SA node, AV node, bundle of His, and Purkinje fibers.

Question 6

Which of the following best describes the histological structure of the spleen?

TheoryPractice · Accepted Answer

White pulp, red pulp, and a fibrous capsule. The spleen consists of white pulp (lymphoid tissue arranged around central arteries) and red pulp (blood-filled sinusoids and splenic cords), surrounded by a fibrous capsule with trabeculae extending inward.

Question 7

Which of the following vessels drain lymph from the lower limbs and abdomen?

TheoryPractice · Accepted Answer

Cisterna chyli. The cisterna chyli collects lymph from the lower limbs and abdomen before it enters the thoracic duct, which is the largest lymphatic vessel in the body.

Question 8

Which of the following is the correct sequence of blood flow through the heart?

TheoryPractice · Accepted Answer

Right atrium → right ventricle → pulmonary arteries → pulmonary veins → left atrium → left ventricle → aorta. Blood flows through the heart in this sequence: right atrium → right ventricle → pulmonary arteries → lungs → pulmonary veins → left atrium → left ventricle → aorta.

Question 9

Which of the following is the most accurate description of a lymph node?

TheoryPractice · Accepted Answer

A bean-shaped structure that filters lymph and contains lymphocytes. Lymph nodes are bean-shaped structures along lymphatic vessels that filter lymph and contain lymphocytes and macrophages that detect and respond to foreign antigens.

Question 10

During embryonic development, which of the following structures gives rise to the majority of the heart's myocardium?

TheoryPractice · Accepted Answer

Splanchnic mesoderm. The splanchnic mesoderm gives rise to the majority of the heart's myocardium during embryonic development. This mesoderm forms the cardiogenic region that develops into the primitive heart tube.

NBCE Part 1 Chiro Exam Prep Exam Questions & Answers 2026 (11–20)

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