Which organ is primarily responsible for bile secretion in mammals?

The liver is the primary organ responsible for the secretion of bile in mammals. Bile is a digestive fluid that plays a crucial role in the emulsification of fats, making them easier to digest and absorb in the small intestine. The liver produces bile continuously, which is then stored and concentrated in the gallbladder until it is needed for digestion.

When fatty food enters the small intestine, hormones signal the gallbladder to release the stored bile into the digestive tract. While the gallbladder stores bile and the small intestine is where the bile acts, the actual production of bile takes place in the liver. Therefore, understanding the liver's role as the source of bile is essential in comprehending the digestive process in mammals. The gallbladder, pancreas, and small intestine have different functions, such as storage or further digestion, but they do not secrete bile.