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Blood vessels in a lung, SEM
Blood vessels in a lung, coloured scanning electron micrograph (SEM) of a resin cast. The lungs facilitate gaseous exchange of oxygen from the air breathed into the lungs with carbon dioxide formed by cell respiration. The fine network of smaller vessels seen branching off from the main vessel infiltrate the tissue, supplying it with blood. Gases and nutrients are exchanged between the blood and the surrounding tissues through the permeable walls of capillaries, the smallest of blood vessels. The cast was made by injecting resin into the blood vessels, followed by chemical digestion of the surrounding tissues. Magnification: x8 at 6x7cm size.
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