Which organ is responsible for filtering blood and producing urine?

The kidneys are essential organs in the body's excretory system, primarily responsible for filtering blood and producing urine. They work by filtering waste products and excess substances from the bloodstream, which are then excreted as urine. Each kidney contains nephrons, the functional units that perform this filtration process. The kidneys also help regulate electrolyte balance, blood pressure, and pH levels in the body, making them vital for maintaining homeostasis.

In this context, the pancreas, liver, and spleen serve different, yet important, functions. The pancreas plays a crucial role in digestion and regulating blood sugar levels, while the liver is involved in metabolic processes, including detoxification and production of various biochemicals necessary for digestion. The spleen is part of the immune system, filtering blood and managing the recycling of iron from red blood cells. However, none of these organs perform the specific function of filtering blood and producing urine as the kidneys do.