Buna is a census-designated place in Jasper County, Texas, United States. The population was 2,142 at the 2010 census.
Gas Exchange. Gas exchange is the process by which oxygen and carbon dioxide (the respiratory gases) move in opposite directions across an organism's respiratory membranes, between the air or water of the external environment and the body fluids of the internal environment.
Jet ventilation, gas exchange. Definition. Jet ventilation can be performed via either high or low frequency means. High frequency jet ventilation (HFJV) is accomplished with specialized ventilators capable of producing the high pressure, low volume breaths necessary. Low frequency jet ventilation (LFJV), however, is usually accomplished with a manually triggered hand-held device.