EKG Technician Exam Questions & Answers 2026 (21–30)

Question 1

The property that allows a cardiac cell to respond to a stimulus is called:

TheoryPractice · Accepted Answer

Excitability (irritability). Excitability, also called irritability, is the ability of a myocardial cell to depolarize in response to an electrical stimulus.

Question 2

During the absolute refractory period, the cardiac cell:

TheoryPractice · Accepted Answer

Cannot be stimulated to depolarize again no matter how strong the stimulus. In the absolute refractory period the cell cannot respond to any stimulus, which protects the heart from premature, sustained contractions.

Question 3

The largest artery in the body, which carries oxygenated blood from the left ventricle, is the:

TheoryPractice · Accepted Answer

Aorta. The aorta exits the left ventricle through the aortic valve and distributes oxygenated blood to the systemic circulation.

Question 4

Deoxygenated blood from the upper body returns to the right atrium through the:

TheoryPractice · Accepted Answer

Superior vena cava. The superior vena cava drains the head, neck, and upper limbs into the right atrium; the inferior vena cava drains the lower body.

Question 5

Which valve lies between the right atrium and the right ventricle?

TheoryPractice · Accepted Answer

The tricuspid valve. The tricuspid valve has three leaflets and prevents backflow from the right ventricle into the right atrium during contraction.

Question 6

Oxygenated blood returns from the lungs to the heart by way of the:

TheoryPractice · Accepted Answer

Pulmonary veins. The pulmonary veins are unusual in carrying oxygen-rich blood; they deliver it from the lungs to the left atrium.

Question 7

The ability of cardiac muscle cells to shorten and produce a heartbeat is called:

TheoryPractice · Accepted Answer

Contractility. Contractility is the mechanical property by which myocardial fibers shorten in response to depolarization to pump blood.

Question 8

The internodal pathway that conducts the impulse across the atria from the SA node toward the left atrium is the:

TheoryPractice · Accepted Answer

Bachmann bundle. The Bachmann bundle is an interatrial conduction tract that helps spread the SA node impulse to the left atrium for coordinated atrial depolarization.

Question 9

The wall that separates the right and left sides of the heart is the:

TheoryPractice · Accepted Answer

Septum. The interatrial and interventricular septa divide the heart into right and left sides, keeping oxygenated and deoxygenated blood separate.

Question 10

The term 'systole' refers to which part of the cardiac cycle?

TheoryPractice · Accepted Answer

Contraction of the heart chambers. Systole is the contraction phase that ejects blood from the chambers; diastole is the relaxation and filling phase.

EKG Technician Exam Questions & Answers 2026 (21–30)

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