In human beings, ventilation will involve a coordinated exertion of several muscles and constructions to move air into and out of the lungs. The primary muscle driving this process will be the diaphragm, a dome-formed muscle mass at the base on the lungs, separating the upper body and abdominal cavities. https://ventilation-ductwork67889.tinyblogging.com/the-2-minute-rule-for-ventilation-ductwork-81424676