This article waslast modified on 10 July 2017.
  1. Tiny blood vessels approximately 0.008 mm in diameter connecting small arteries (arterioles) and small veins (venules). Through the one cell-layer thick walls of capillaries, oxygen and nutrients are passed from arterioles to body tissues, and carbon dioxide and other wastes are passed from body tissues to venules.
  2. Any other small, hairlike tube for carrying lymph or other material.