Terminal bronchioles of conducting airways have ciliated and goblet cells to help clear particulate matter.
Respiratory bronchioles mark the beginning of the respiratory zone and have alveoli in their walls.
Rib cage and spine Diaphragm Intercostal muscles Respiratory control is a complex, integrated phenomenon with voluntary and involuntary controls. O2 diffuses to capillary. Pulmonary arteries distribute blood to the pulmonary capillary system to maximize erythrocyte exposure to alveolar gas tensions. The bronchial vessels arise from the aorta and carry nutrient blood to the airways. Thus the lung is efficiently designed to conduct and distribute gas to a very large, thin diffusion membrane with good blood supply.