Lung tissue. Coloured scanning electron micrograph of human lung tissue showing details of the air sacs (alveoli) and blood vessels. As the organ of gas exchange from air to blood, and vice versa, the lungs are well supplied with blood capillaries. Here, alveoli are seen surrounding a thick-walled round blood vessel (at above centre). Variously shaped alveoli have lattice-like walls with a network of capillaries resembling tubes on their surface (see far right). At lower centre, a small rounded blood vessel is filled with a clot (thrombus); even smaller blood vessels are seen at upper left.Mag:x425 at 8x10inch,x127 at 6x7cm size

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