B) Liver

The correct answer is option 'b', which states that bile juice is secreted by the liver.

The liver is an essential organ of the digestive system that performs various functions, including the production and secretion of bile juice. Bile juice is a greenish-yellow fluid that aids in the digestion and absorption of fats in the small intestine.

Bile is produced in the liver and stored in the gallbladder. When we consume a fatty meal, the gallbladder releases the stored bile into the small intestine through a duct called the common bile duct. The bile then helps in the breakdown of fats into smaller molecules, making it easier for the body to absorb and utilize them.

Bile is composed of several substances, including bile salts, cholesterol, bilirubin, phospholipids, and electrolytes. Bile salts are the most important component as they help in the emulsification of fats. Emulsification is the process of breaking down large fat globules into smaller droplets, increasing their surface area for the action of digestive enzymes called lipases.

The liver continuously produces bile, regardless of whether we have consumed a fatty meal or not. However, the release of bile into the small intestine is regulated by the hormone cholecystokinin (CCK), which is released in response to the presence of fats in the small intestine. CCK signals the gallbladder to contract and release bile, ensuring that it is available when needed for fat digestion.

In summary, bile juice is secreted by the liver, and it plays a crucial role in the digestion and absorption of fats in the small intestine. The liver continuously produces bile, which is stored in the gallbladder and released into the small intestine when fats are present. Bile helps in the emulsification of fats, making them more accessible to digestive enzymes for efficient digestion and absorption.

Bile juice is a digestive fluid produced by the liver. It is stored and concentrated in the gallbladder. Its main function is to convert fats in food into fatty acids, which are absorbed in the gut.