Which organ is responsible for the majority of metabolic processes in the body?

The liver is the organ known for carrying out the majority of metabolic processes in the body. It plays a crucial role in various functions, including the processing of nutrients absorbed from the digestive tract, detoxification of harmful substances, synthesis of proteins such as albumin and clotting factors, and regulation of blood sugar levels through glycogen storage and release. The liver also aids in the metabolism of fats, carbohydrates, and proteins, serving as a central hub for various biochemical reactions necessary for maintaining homeostasis.

In contrast, the lung primarily focuses on gas exchange, facilitating the intake of oxygen and the expulsion of carbon dioxide, rather than metabolic processes. The kidney plays a key role in filtering blood, regulating electrolyte balance, and eliminating waste products through urine, but it is not the primary site of metabolism. The heart is primarily responsible for pumping blood throughout the body, ensuring the delivery of nutrients and oxygen, but it does not participate in metabolic processes in the same way that the liver does. Therefore, the liver's comprehensive involvement in metabolism makes it the key organ for these functions.