Multiple choice

The smallest blood vessel of the body is

  1. Arteries

  2. Arteriole

  3. Capillaries

  4. Venule
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Capillaries are the smallest of a body's blood vessels and are parts of the microcirculation. They are only 1 cell thick. These microvessels, measuring 5-10 μm in diameter, connect arterioles and venules, and enable the exchange of water, oxygen, carbon dioxide, and many other nutrient and waste chemical substances between blood and surrounding tissues.

Keep practicing — related questions