CCK’s role includes enhancing digestion primarily by increasing which of the following?

• A. Insulin secretion
• B. Bile release
• C. Glucose absorption
• D. Fiber breakdown

Answer: (B)

Cholecystokinin (CCK) is a hormone secreted by the cells in the duodenum in response to the presence of fats and proteins in the chyme. One of CCK's primary roles is to facilitate digestion by enhancing the release of bile from the gallbladder. Bile, produced by the liver and stored in the gallbladder, contains bile salts that emulsify fats, making them easier for digestive enzymes to break down. This increased release of bile helps in the digestion and absorption of dietary fats.

While insulin secretion, glucose absorption, and fiber breakdown are important processes in digestion, they are not directly enhanced by CCK in the same way that bile release is. Insulin secretion is more closely related to the presence of glucose in the bloodstream and is regulated by different hormonal signals. Glucose absorption occurs in the intestine and involves different transport mechanisms. Fiber breakdown primarily involves microbial fermentation in the gut rather than hormonal regulation by CCK. Therefore, the enhancement of bile release is the key function of CCK in promoting digestion.