In human beings, ventilation entails a coordinated work of several muscles and constructions to move air into and out on the lungs. The first muscle mass driving this process could be the diaphragm, a dome-shaped muscle mass at the base with the lungs, separating the upper body and abdominal cavities. https://ventilationductwork01122.topbloghub.com/43894184/everything-about-ventilation-ductwork