The Heart

Question 18 • 2026-2027 EDGE Human Anatomy and Physiology B

What are Purkinje fibers?

Answer

special valves that relay electrical impulses to the ventricles, which cause contraction

special fibers that relay electrical impulses to the atriums, which cause emptying

special valves that relay blood to the ventricles, which cause contraction

special fibers that relay electrical impulses to the ventricles, which cause contraction

Explanation

Purkinje fibers are specialized cardiac muscle fibers that carry electrical impulses through the ventricles. This electrical activation causes the ventricles to contract and pump blood. Choice D correctly describes them; they are fibers, not valves, and they act on the ventricles rather than the atria.

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