Which organ filters blood to remove amino acids and some harmful toxins?

The liver plays a crucial role in filtering blood, which includes removing amino acids and processing harmful toxins. It is a vital organ that metabolizes nutrients absorbed from the digestive tract. Among its many functions, the liver converts excess amino acids into usable forms, such as glucose or fatty acids, for energy storage or production. It also detoxifies various metabolites, processes drugs, and produces important biochemicals necessary for digestion. This complex organ ensures that the body maintains a balanced internal environment by regulating substances in the blood.

In contrast, while the kidneys also filter blood, their primary role is to remove waste products and excess substances from the bloodstream to form urine, rather than specifically filtering for amino acids and toxins as the liver does. The heart is primarily responsible for pumping blood throughout the body, and the spleen mainly filters blood components related to the immune system and the removal of old or damaged red blood cells. Thus, the liver is the organ specifically associated with the filtration of blood for amino acids and toxins.