In the fly oxygen is transported by direct diffusion. The respiratory or tracheal system is an interconnected tubular organ that provides oxygen via specialized terminal branches. Acquired with a Leica SP5 confocal microscope at
Tracheal terminal cells provide oxygen to the gastrointestinal system
![Tracheal terminal cells provide oxygen to the gastrointestinal system 14710318135_c29c23bac0_k](https://i0.wp.com/www.linneweb.de/wp-content/uploads/2016/07/14710318135_c29c23bac0_k-620x408.jpg)