Multiple choice

Which of the following organs is the thinnest?

  1. Artery

  2. Vein

  3. Lymphatic vessels

  4. Capillary

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Capillaries are the thinnest blood vessels, with walls only one cell thick to facilitate the exchange of gases, nutrients, and wastes between blood and tissues. Arteries and veins have much thicker, multi-layered walls to withstand pressure or contain larger volumes. Lymphatic vessels are also thicker than individual capillaries.

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