Figure A shows the organs that primary ciliary dyskinesia can affect. Figure B shows a cross-section of the trachea (windpipe). Figure C shows a closeup view of normal cilia lining the trachea. The cilia move together in wave-like motions to transport mucus toward the mouth. Figure D shows a closeup view of faulty cilia lining the trachea. The cilia are deformed and do not move together, causing a buildup of mucus.