F / col TEM of capillary in alveolar septum of lung

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F / col TEM of capillary in alveolar septum of lung

False-colour transmission electron micrograph (TEM) of human lung tissue, showing an alveolar septum, the partition between the alveoli (air sacs) where gas exchange takes place. Blood vessels (capillaries) extend across the entire septum, coloured yellow in this image & filled with red blood cells (dark red). The purple- coloured cell in centre of image with a large nucleus is one of the two alveolar cell types or pneumocytes. Type II cells are believed to secrete surfactant, a substance that reduces alveolar surface tension & prevents the air sacs from collapsing. Magnification: x2, 200 at 6x7cm size

Science Photo Library features Science and Medical images including photos and illustrations

Media ID 6449541

© CNRI/SCIENCE PHOTO LIBRARY PHOTO LIBRARY

Air Sac Alveolar Alveolus Capillary Lung Lungs Respiratory System Septum Type Ii

EDITORS COMMENTS
This stunning false-colour transmission electron micrograph (TEM) print captures the intricate beauty of a capillary in the alveolar septum of a human lung. The alveolar septum acts as a crucial partition between the air sacs, known as alveoli, where vital gas exchange occurs. In this image, blood vessels or capillaries can be seen extending across the entire septum, depicted in vibrant yellow and filled with dark red blood cells. At the center of this mesmerizing composition lies a distinctive purple-colored cell with a large nucleus. This cell belongs to one of the two types of alveolar cells called pneumocytes. Specifically, it is an example of an alveolar type II cell which plays a significant role in secreting surfactant—a substance essential for reducing surface tension within the air sacs and preventing their collapse. The magnification used to capture this extraordinary detail is x2,200 at 6x7cm size, allowing us to appreciate the intricacies and complexities that exist within our respiratory system. This remarkable photograph not only showcases the delicate network of capillaries but also highlights how different cellular components work together harmoniously to ensure efficient gas exchange within our lungs. Courtesy of Science Photo Library, this print serves as both an educational tool and artistic masterpiece—reminding us once again of nature's breathtaking wonders found within our own bodies.

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