Bile is a digestive juice that is secreted by the liver and stored in the gallbladder. It has two important functions : Assists with fat digestion and absorption in the gut.

Liver secretes bile in the human digestive system.
Bile is an important digestive fluid that plays a crucial role in the digestion and absorption of fats. It is produced by the liver and stored in the gallbladder. When food enters the small intestine, bile is released into the duodenum, the first part of the small intestine, through the common bile duct.
Explanation:
Here is a detailed explanation of why bile is secreted by the liver in the human digestive system:
1. Function of bile: Bile helps in the digestion and absorption of fats. It emulsifies fats, breaking them down into smaller droplets, which increases the surface area for the action of digestive enzymes. This process allows for the efficient digestion and absorption of fats in the small intestine.
2. Liver production: Bile is produced by the liver cells, specifically by the hepatocytes. The liver continuously produces bile, which is then transported to the gallbladder for storage.
3. Bile composition: Bile is composed of bile salts, bile pigments (such as bilirubin), cholesterol, phospholipids, and electrolytes. These components work together to facilitate fat digestion.
4. Gallbladder storage: After production, bile is transported from the liver to the gallbladder through the bile ducts. The gallbladder acts as a storage organ for bile. When needed for digestion, the gallbladder contracts, releasing bile into the small intestine.
5. Bile release: When fatty food enters the small intestine, the hormone cholecystokinin (CCK) is released. CCK stimulates the gallbladder to contract, causing the release of bile into the duodenum through the common bile duct.
6. Bile's role in digestion: Once in the small intestine, bile emulsifies fats, breaking them down into smaller droplets. This process, aided by pancreatic lipase (an enzyme produced by the pancreas), allows for the efficient digestion of fats into fatty acids and glycerol.
In summary, bile is secreted by the liver in the human digestive system. It plays a crucial role in the digestion and absorption of fats by emulsifying them and increasing their digestibility.