Final answer:
The correct component not present in the pancreatic fluid secreted by the pancreas in response to secretin is bile, because bile is produced by the liver, not the pancreas.
Step-by-step explanation:
In response to the hormone secretin, the pancreas secretes a fluid rich in digestive enzymes and bicarbonate ions, but not all components mentioned are part of this secretion. The pancreatic fluid does contain amylase, which helps in digesting carbohydrates, and bicarbonate ions to neutralize the acidic chyme from the stomach. It also has enzymes like pancreatic lipase and pancreatic nuclease for the digestion of lipids and nucleic acids, respectively. However, it does not contain bile, which is produced by the liver and stored in the gallbladder, nor does it contain mucus. Therefore, the correct answer to which of the following is NOT present in the pancreatic fluid is bile, as it is a separate substance released into the duodenum to aid in fat digestion.