Lab Tests Online - Explaining Pathology



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 to body tissues, and carbon dioxide and other wastes are passed from body tissues back to the bloodstream.

2. Any other small, hairlike tube for carrying lymph or other material.