Lung alveoli & bronchus. Coloured Scanning Elec- tron Micrograph (SEM) of lung tissue, showing alveoli, a bronchus, and a pulmonary blood vessel. A lo

---

Lung alveoli & bronchus. Coloured Scanning Elec- tron Micrograph (SEM) of lung tissue, showing alveoli, a bronchus, and a pulmonary blood vessel. A longitudinal section through a branching bronchus-air tube (blue) is seen. At lower right is a cross-sectioned pulmonary blood vessel (blue). Spongy lung tissue (green) surrounds these two structures; this is made up of alveoli air sacs whose interstital walls are lined with blood capillaries. Air passes from the bronchus into the alveoli. Oxygen from the breathed-in air is absorbed into the blood and distributed to the rest of the body to be used in respiration. Magnification: x54 at 6x7cm size.

---

Size: 4961px × 3603px
Photo credit: © PROF CINTI & V. GREMET/SPL SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: air, alveolus, anatomy, blood, body, bronchus, human, lung, lungs, respiratory, sac, system, vessel