Which organs are primarily involved in nitrogen elimination in the body?

The primary organs involved in nitrogen elimination in the body are the liver and kidneys. The liver plays a crucial role in the urea cycle, where ammonia, a toxic by-product of protein metabolism, is converted into urea. This urea is then released into the bloodstream and transported to the kidneys for excretion.

The kidneys are essential for filtering the blood and excreting waste products, including urea, through urine. They help maintain the body's fluid and electrolyte balance while effectively eliminating nitrogenous waste. This collaboration between the liver and kidneys allows the body to efficiently manage nitrogen levels and prevent the accumulation of toxic metabolites.

Other organs, while they have important functions, do not play a direct role in nitrogen elimination in the way that the liver and kidneys do. For example, the lungs are primarily involved in gas exchange and not directly in the elimination of nitrogen from the body. Similarly, the pancreas is involved in digestive processes and regulation of blood sugar but does not contribute significantly to nitrogen elimination. Therefore, the liver and kidneys are the correct answer for the primary organs involved in this critical metabolic process.