Conversion of trypsinogen to trypsin is brought by

Options

A. Enterokinase
B. Enterokinin
C. Endopeptidase
D. Pepsin

Answer

To answer the question "Conversion of trypsinogen to trypsin is brought by," we can follow these steps:

### Step 1: Understand Trypsinogen
- **Definition**: Trypsinogen is the inactive precursor (zymogen) of the enzyme trypsin.
- **Source**: It is produced by the pancreas and is part of the pancreatic juice.

### Step 2: Identify the Activation Process
- **Activation**: Trypsinogen needs to be converted into its active form (trypsin) to perform its function in protein digestion.
- **Importance of Activation**: This conversion is crucial because trypsin is a proteolytic enzyme that helps in breaking down proteins into smaller peptides.

### Step 3: Identify the Enzyme Responsible for Activation
- **Key Enzyme**: The enzyme responsible for converting trypsinogen to trypsin is called **enterokinase** (also known as enteropeptidase).
- **Source of Enterokinase**: Enterokinase is secreted by the intestinal mucosa.

### Step 4: Understand the Role of Trypsin
- **Function of Trypsin**: Once activated, trypsin can then activate other digestive enzymes present in the pancreatic juice, such as chymotrypsinogen and procarboxypeptidase, further aiding in protein digestion.

### Conclusion
- The correct answer to the question is **enterokinase**, as it is the enzyme that converts trypsinogen into trypsin.