Which organ is primarily responsible for excreting water and other waste products?

The kidneys are primarily responsible for excreting water and other waste products. They perform this vital function through a process called filtration, where they remove waste from the blood and balance electrolytes and fluids in the body. The kidneys filter out excess water, urea, creatinine, and other metabolic byproducts to produce urine, which is then excreted from the body.

While the liver does play a role in detoxifying chemicals and metabolizing drugs, its primary function is related to digestion and metabolism rather than waste excretion. The lungs are responsible for excreting carbon dioxide, a waste product of respiration, but they do not handle water or other metabolic wastes in the same way the kidneys do. The skin can excrete some waste products through sweat; however, its primary role is in thermoregulation and protection rather than the primary organ for waste filtration. Thus, the kidneys stand out as the main organ for excreting water and various waste products from the body.