R. BICK, B. POINDEXTER, UT MEDICAL SCHOOL / SCIENCE PHOTO LIBRARY R. BICK, B. POINDEXTER, UT MEDICAL SCHOOL / SCIENCE PHOTO LIBRARY
Lung tissue. Fluorescence deconvolution micrograph of a section through lung tissue showing the lumen (black) of the airways. This tissue sample shows the transition from a small (respiratory) bronchiole to a terminal duct (the region where the alveoli are present). The lungs are where blood is oxygenated, with the oxygen replacing the waste product carbon dioxide that is produced during respiration in body cells. Cellular proteins are highlighted with fluorescent markers: smooth muscle actin (red), f-actin (green) and cell nuclei (blue).
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