Question

Enzyme which is not involved directly in digestion of food is
O Pepsin
O Pancreatic lipase
O Enterokinase
O Trypsin​

Answer 1

Option 3 is correct

Enterokinase

Amylase, trypsin, and  enterokinase are enzymes, whereas  enterokinase is a hormone. Trypsin is a proteolytic enzyme, while Amylase is a starch breaking enzyme.  Enterokinase is a proteolytic enzyme that transforms trypsinogen into active trypsin. Enterogastrone is a hormone secreted by the duodenal mucosa in response to fatty foods in the stomach or small intestine. It is also considered to be released in response to carbohydrates and proteins in the gut. Enterogastrone travels through the circulation to the glands and muscles of the stomach, where it suppresses gastric motions and secretions, potentially by inhibiting the synthesis or action of gastrin, the hormone that induces these activities in the first place.

Answer 2

As we know that the Enzyme which does not directly act upon food substrate is enterokinase (it act on another proenzymes trypsinogen).

• As we know that Enterogastrone is a hormone, whereas amylase, trypsin, and enterokinase are enzymes.
• So, Amylase is a starch-splitting enzyme, while trypsin is a proteolytic enzyme.
• So, Enterokinase is a proteolytic enzyme, which acts on trypsinogen and converts it to active trypsin.
• And Enterogastrone is a hormone secreted by the duodenal mucosa, when fatty food is in the stomach or small intestine; it is also thought to be released when sugars and proteins are in the intestine.
• Then the Enterogastrone is transported by the bloodstream to the glands and muscles of the stomach, where it inhibits gastric movements and secretions, possibly by blocking the production or activity of gastrin, the hormone that initially causes these functions.

Hence, the correct answer is option 3. Enterokinase.