True or False
The serosa is present throughout the entire length of the alimentary canal.

A. Help buffer chyme:Buffering is primarily performed by bicarbonate ions secreted by the ductal cells, not the digestive enzymes. These enzymes focus on the hydrolysis of macromolecules. They do not have the chemical properties to neutralize acid.

B. Are absorbed in the stomach:These enzymes are secreted into the duodenum for intestinal digestion. They are proteins themselves and would be denatured by the low pH of the stomach. Their site of action is distal to the pylorus.

C. Are already denatured:If these enzymes were denatured, they would lose their tertiary structure and catalytic functionality. The pancreas secretes them in a functional state to ensure nutrient breakdown. Denaturation would render them useless for digestion.

D. Don't harm pancreatic tissue:Unlike proteases, which are secreted as inactive zymogens to prevent autodigestion, these enzymes do not digest the structural lipids or proteins of the pancreas. They only target specific dietary substrates. This prevents acute pancreatitis.

False:The pancreas is primarily a retroperitoneal organ, with the exception of the tail which may be intraperitoneal. It is situated behind the lesser sac of the omentum. Its anatomical position at L1 and L2 is correct, but its peritoneal status is not.