1.7, page 16. The base is concave so that it fits snuggly over the convex diaphragm. The hilus is also where the primary bronchi enter the lungs. The right lung is thicker, broader and shorter than the left lung. The liver, which is below the diaphragm on the right side, pushes the diaphragm up, causing the right lung to be shorter than the left lung.
Ventilation depends upon a pressure difference between the lungs and the outside atmosphere.
Because of the pleural membrane, the lungs cling to the thoracic cavity wall, so that when the thoracic cavity expands, the lungs expand. When it contracts, it flattens. This causes the lungs to be pulled down, increasing the internal volume of the lungs. When the external intercostals contract, they pull the ribcage up and out. This also increases the internal volume of the lungs.