Which of the following controls the secretion of GI tract

Options

A. Myoenteric plexus
B. Submucosal plexus
C. Auerbachs plexus
D. Both 1 &3

Answer

To answer the question "Which of the following controls the secretion of the GI tract?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the GI Tract Structure**:
- The gastrointestinal (GI) tract has several layers, including the mucosa, submucosa, muscularis, and serosa. Each layer has specific functions.

2. **Identifying Key Plexuses**:
- Within the GI tract, there are two important nerve plexuses:
- **Meissner's Plexus (Submucosal Plexus)**: Located in the submucosa, it primarily regulates local blood flow and electrolyte balance.
- **Myoenteric Plexus (Auerbach's Plexus)**: Located between the circular and longitudinal muscle layers, it is responsible for the motility of the GI tract.

3. **Function of the Plexuses**:
- The myoenteric plexus is crucial for controlling the motility and secretion of the GI tract. It coordinates the contractions of the muscularis layer, which aids in both movement and secretion of digestive juices.
- The Meissner's plexus also plays a role in regulating secretions but is more focused on local conditions.

4. **Conclusion**:
- Both the myoenteric plexus and Meissner's plexus are involved in controlling the secretion of the GI tract. Therefore, the correct answer to the question is that both plexuses contribute to this function.

5. **Final Answer**:
- The correct option is **both myoenteric plexus and Meissner's plexus** (Option 4: both 1 and 3).