Multiple choice

The smallest blood vessels of the body are

  1. arteries

  2. venule

  3. veins

  4. capillaries

Reveal answer Fill a bubble to check yourself
D 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.