Trypsinogen is converted into active trypsin by the action of

Options

A. Cholecystokinin
B. Enterogastrone
C. Enterokinase
D. Secretin

Answer

To solve the question "Trypsinogen is converted into active trypsin by the action of," follow these steps:

### Step 1: Understand the Terms
- **Trypsinogen**: This is an inactive precursor (zymogen) of the enzyme trypsin, which is produced by the pancreas.
- **Trypsin**: This is the active form of the enzyme that helps in protein digestion.

### Step 2: Identify the Conversion Process
- The conversion of trypsinogen to trypsin is a crucial step in the digestive process. This conversion is necessary for the activation of trypsin, which then aids in breaking down proteins into smaller peptides.

### Step 3: Know the Enzyme Responsible for Activation
- The enzyme responsible for converting trypsinogen into trypsin is **Enterokinase** (also known as Enteropeptidase). This enzyme is secreted by the cells of the duodenum, which is the first part of the small intestine.

### Step 4: Evaluate the Options
- A. Cholecystokinin: This hormone stimulates the gallbladder to release bile and the pancreas to release digestive enzymes but does not activate trypsinogen.
- B. Enterogastrone: This is a hormone that inhibits gastric motility and secretion but does not activate trypsinogen.
- C. Enterokinase: This is the correct answer as it activates trypsinogen to trypsin.
- D. Secretin: This hormone stimulates the pancreas to secrete bicarbonate and does not activate trypsinogen.

### Step 5: Conclusion
- The correct answer is **C. Enterokinase**.

### Final Answer
Trypsinogen is converted into active trypsin by the action of **Enterokinase**.

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