Final answer:
Bile is vital for lipid digestion, primarily containing bile salts, bilirubin, and cholesterol. Triglycerides are not a component of bile but are rather digested and emulsified by bile in the small intestine. Hence, 'd. Triglyceride' is the correct answer.
Step-by-step explanation:
Components of Bile
Bile is a critical digestive fluid produced in the liver and stored in the gallbladder. It plays an essential role in the digestion of lipids by the process of emulsification, where it breaks large lipid globules into smaller ones in the watery environment of the small intestine. Bile's primary components include bile salts, which are synthesized from cholesterol and help in the transport of lipids across the intestinal membrane, and bilirubin, which is a byproduct of red blood cell breakdown. Additionally, cholesterol is also a component of bile, often being secreted into the intestine as a part of bile to be eliminated or contributing to the formation of gallstones if it precipitates.
However, triglycerides are not a component of bile. They are a form of dietary fat that, once ingested, ends up in the intestine where bile works to emulsify them, aiding in their digestion and absorption. After emulsification, triglycerides are broken down into fatty acids and monoglycerides, which are then absorbed by the intestinal lining. In contrast, bile itself contains no triglycerides, making the answer choice. Triglyceride is the correct option for the component not found in bile. Therefore, about the initial query, the component that is NOT a part of bile is triglycerides.