Simple Description

A blood vessel that is only one cell thick

Further Detail

Blood vessels are either veins, arteries or capillaries. Capillaries are the smallest and are only one cell think. Substances can diffuse through capillaries into organs; for example, carbon dioxide diffuses out from cells into the lungs through a network of capillaries.

Related Words:

• Artery
• Vein
• Diffusion

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