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Medical Assistant NCMA Practice Test

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“From beautiful, downtown Hemato City, this is Name That Organ, with your favorite host and mine, the wonderful Ana Tomy! I’m your announcer Fizzy Ology. Before we start the next game, let’s play a warm-up round!”
“Name 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.
Explanation
Answer: C - It is within the capillaries that 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 exchange 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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