Kaplan Nursing Entrance Practice Exam

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What is notable about the diameter of capillaries?

  1. They are wider than arteries

  2. They are very small in diameter

  3. They have no diameter

  4. They vary widely in size

The correct answer is: They are very small in diameter

The notable characteristic of capillaries is that they are very small in diameter. This microscopic size, typically ranging from about 5 to 10 micrometers, allows capillaries to effectively facilitate the exchange of oxygen, nutrients, and waste products between blood and surrounding tissues. The narrow diameter is essential because it enables red blood cells to pass through in single file, maximizing the surface area available for diffusion and enhancing the efficiency of nutrient and gas exchange. This small size directly contributes to the function of capillaries as they form a vast network throughout the body, providing extensive access to all tissues. The limited diameter also helps control blood flow and pressure, ensuring that capillary beds are perfused effectively according to the metabolic needs of the tissues they supply. Understanding the unique diameter of capillaries is crucial in comprehending their role within the circulatory system.

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