Which organ is responsible for preparing nitrogenous wastes for disposal?

The liver is the organ responsible for preparing nitrogenous wastes for disposal. It plays a crucial role in the metabolism of proteins and amino acids, where it breaks down these compounds. One of the byproducts of this process is ammonia, which is toxic to the body. The liver converts ammonia into urea through the urea cycle, a far less toxic compound that can be safely transported in the bloodstream to the kidneys, where it is eventually excreted in urine. This detoxification and preparation of nitrogenous waste for elimination is a vital function of the liver, showcasing its central role in maintaining metabolic homeostasis.

The other organs listed do not specifically carry out this function. The gallbladder primarily stores bile produced by the liver for digestion, the pancreas produces digestive enzymes and hormones like insulin, and the large intestine is mainly involved in the absorption of water and the formation of feces rather than the processing of nitrogenous wastes.