Phlebotomy Technician Practice Exam (NCPT/CPT)

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Prepare for the Phlebotomy Technician Exam (NCPT/CPT). Study with flashcards and multiple-choice questions, each with hints and explanations. Get ready for your exam!

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Lumen is defined as

  1. The outer layer of an artery

  2. Space within the walls of an artery, vein, or tube

  3. A blockage in a blood vessel

  4. The innermost lining of the heart

The correct answer is: Space within the walls of an artery, vein, or tube

The correct explanation for this question is that lumen refers to the space within the walls of an artery, vein, or tube. This means that options A, C, and D are incorrect because they refer to different anatomical structures that are not the same as lumen. Option B is the only choice that accurately describes lumen and its location within the body. A lumen is the hollow part of a tubular structure, such as blood vessels or the digestive tract, through which substances flow. So, option B is the correct choice because it accurately defines lumen.

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