Final answer:
The liver is the largest gland in the human body and plays a crucial role in metabolism and regulation.
Step-by-step explanation:
The largest gland in the human body is the liver. It weighs about three pounds in an adult and plays a crucial role in metabolism and regulation. The liver is responsible for several functions, including the synthesis of glucose, breakdown of glycogen, and processing of vitamins and fats. It also produces bile, which aids in the digestion of fats.