Human capillary

Colored scanning electron micrograph (SEM) of a cross-section of a human capillary, showing the red blood cells (red discs) it contains.The smallest type of blood vessel, capillaries pervade body tissue,forming a fine network that links veins and arteries.They have permeable walls that allow the exchange of gases andnutrients between the blood and tissue. Also known as erythrocytes,red blood cells transport oxygen to the tissue and carbon dioxideback to the lungs. Magnification: 2.600 X