Trypsinogen is activated by an enzyme,________,secreted by the intestinal mucosa

Options

A. Enterogastron
B. Enterokinase
C. Carboxypeptidase
D. Erepsin

Answer

To solve the question, we need to identify the enzyme that activates trypsinogen and is secreted by the intestinal mucosa. Let's go through the steps systematically:

### Step-by-Step Solution:

1. **Understanding Trypsinogen**:
- Trypsinogen is an inactive precursor (zymogen) of the enzyme trypsin, which is involved in protein digestion.

2. **Activation of Trypsinogen**:
- Trypsinogen needs to be activated to trypsin to perform its function.

3. **Identifying the Activating Enzyme**:
- The question specifies that we are looking for an enzyme that activates trypsinogen and is secreted by the intestinal mucosa.

4. **Options Provided**:
- The options given are:
- A) Enterogastron
- B) Enterokinase
- C) Carboxypeptidase
- D) Erapsine

5. **Analyzing the Options**:
- **Enterogastron**: This is a hormone that inhibits gastric secretion, not involved in activating trypsinogen.
- **Enterokinase**: This enzyme is secreted by the intestinal mucosa and is responsible for converting trypsinogen into trypsin.
- **Carboxypeptidase**: This is an enzyme that acts on peptides but does not activate trypsinogen.
- **Erapsine**: This is not a recognized enzyme related to trypsinogen activation.

6. **Conclusion**:
- Based on the analysis, the correct answer is **B) Enterokinase**.

### Final Answer:
Trypsinogen is activated by an enzyme, **Enterokinase**, secreted by the intestinal mucosa.