What molecule is removed by the lungs?

The primary molecule removed by the lungs is carbon dioxide (CO2). Carbon dioxide is a waste product of cellular respiration and is transported from the tissues to the lungs via the bloodstream. Once in the lungs, CO2 is exhaled into the atmosphere during the process of breathing. The lungs play a crucial role in regulating the levels of carbon dioxide in the bloodstream, maintaining the body's acid-base balance, and ensuring proper functioning of various physiological systems.