Question

Enterokinase stimulates, which of the following?
A. Pepsinogen
B. Trypsin
C. Pepsin
D. Trypsinogen

Answer 1

Hint: An enzyme called enterokinase is secreted by the cells of the duodenum of the small intestine and is involved in the process of digestion of food in humans and other animals. Enterokinase is also known as enteropeptidase. It is one of the main digestive enzymes of the digestive system of many animals and humans.

Complete answer: Various enzymes secreted by different parts of the human digestive system are important for the process of breakdown of complex food into simpler smaller compounds. The human digestive system also called the alimentary canal or gastrointestinal canal comprises the following organs: mouth, oesophagus, pharynx, stomach, small intestine, large intestine, anus and accessory organs. The breakdown of carbohydrates takes place in the mouth with the help of enzyme salivary amylase. Digestion of protein takes place in the stomach with the help of enzyme pepsin. The pepsinogen secreted by the chief cells of stomach lining mixes with the gastric juices and hydrochloric acid activates and converts pepsinogen into pepsin. Pepsin regulates the digestion of proteins in the stomach. The food received from the stomach to the small intestine is partially digested and is in a semi-liquid form known as chyme. The small intestine is further divided into 3 parts called duodenum, jejunum and ileum. The glands of “Bruner” which forms the lining of duodenum secretes a proteolytic enzyme called enteropeptidase which converts the inactive trypsinogen secreted by the pancreatic cells to active trypsin. Therefore, enterokinase stimulates inactive trypsinogen.
So, option D is the correct answer.
Note: Other than digestive organs, accessory organs also play a vital role in the digestion of food. Accessory organs are as follows: tongue, salivary gland, pancreas, liver and gallbladder. These organs secrete enzymes and digestive juices which are necessary for the digestion of food. Saliva, amylase and lipase are secreted by the salivary gland. Bile is produced by liver and pancreas secrete pancreatic juices.