9. The pH of food entering the duodenum is changed from acidic to alkaline by
A. gastric juices
B. bile pigments
C. intestinal enzymes
D. pancreatic secretions
I am unsure I think It is d
YEP YOU ARE CORRECT!!!!
Nope. Use the online dictionary to look up bile.
http://www.m-w.com/cgi-bin/dictionary?book=Dictionary&va=bile
To determine the correct answer to the question, we need to understand the function of each option listed and how it relates to the pH of food in the duodenum.
A. Gastric juices: Gastric juices secreted in the stomach are highly acidic and help break down the food. However, they do not directly change the pH of food in the duodenum.
B. Bile pigments: Bile, which is produced by the liver and stored in the gallbladder, contains bile pigments. Bile is released into the duodenum and helps in the emulsification and digestion of fats. While bile does not directly change the pH of food, it aids in the digestion process in the duodenum.
C. Intestinal enzymes: Intestinal enzymes, such as peptidases, lipases, and carbohydrases, are secreted by the small intestine and help in the digestion and absorption of nutrients. These enzymes do not directly change the pH of food in the duodenum.
D. Pancreatic secretions: The correct answer is D. Pancreatic secretions play a major role in changing the pH of food entering the duodenum from acidic to alkaline. Pancreatic enzymes, such as pancreatic amylase, lipase, and trypsin, are released into the duodenum and help break down carbohydrates, fats, and proteins, respectively. In addition to enzymes, the pancreas also releases bicarbonate ions, which neutralize the acidic chyme (partially digested food from the stomach) and raise the pH of the contents in the duodenum to alkaline levels. This alkaline environment is optimal for the activity of intestinal enzymes.
Therefore, the correct answer is D. Pancreatic secretions.