Certified Nursing Assistant Exam Prep

Category - Medical Assisting

What are the blood vessels where cellular exchange of nutrients and by-products takes place?

  1. Venous blood vessels.
  2. Arterial blood vessels.
  3. Capillary blood vessels.
  4. Fibroids
  5. None of the above

Answer: C - Within the capillaries, oxygen, and fuel are exchanged for waste products. The diameter of a capillary is small, requiring blood cells to squeeze through in single file. Capillary walls are thin; they are only one cell thick. The thin walls and single-file flow allow exchanges to take place. Arterioles feed oxygenated blood into capillary vessels; venules receive the deoxygenated blood and begin the return flow to the heart.

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