The gastric juice contains proteins-splitting enzymes namely :

Options

A. Pepsin and rennin
B. Pepsin and trypsin
C. Rennin and amylase
D. Trypsin and chymotrypsinogen

Answer

**Step-by-Step Solution:**

1. **Understanding Gastric Juice Composition**: Gastric juice is a digestive fluid produced in the stomach, containing various components that aid in digestion, particularly of proteins.

2. **Identifying Protein-Splitting Enzymes**: The question specifically asks for protein-splitting enzymes present in gastric juice. The main enzymes involved in protein digestion are pepsin and renin.

3. **Role of Pepsin**: Pepsin is produced in the stomach as an inactive precursor called pepsinogen, which is activated by hydrochloric acid (HCl) present in gastric juice. Pepsin is essential for breaking down proteins into smaller peptides.

4. **Role of Renin**: Renin, also known as rennin, is present in the gastric juice of infants and is important for digesting milk proteins. It helps coagulate milk, making it easier for the infant's digestive system to process.

5. **Evaluating the Options**:
- **Option A (Pepsin and Renin)**: Correct, as both are protein-splitting enzymes found in gastric juice.
- **Option B (Pepsin and Trypsin)**: Incorrect, as trypsin is not found in gastric juice; it is produced in the pancreas.
- **Option C (Renin and Amylase)**: Incorrect, as amylase is a carbohydrate-digesting enzyme, not a protein-splitting enzyme.
- **Option D (Trypsin and Chymotrypsin)**: Incorrect, as both are produced in the pancreas and not in gastric juice.

6. **Conclusion**: The correct answer is **Option A: Pepsin and Renin**.

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