Mucus is secreted by the

Options

A. Stomach
B. Duodenum
C. Large intestine
D. All of the above

Answer

**Step-by-Step Solution:**

1. **Identify the Structures Involved in Mucus Secretion:**
- Mucus is a viscous fluid that plays a crucial role in protecting and lubricating various parts of the digestive system.

2. **Examine the Stomach:**
- The stomach contains specialized cells known as mucus neck cells. These cells are responsible for the secretion of mucus, which helps protect the stomach lining from the acidic environment and aids in the smooth passage of food.

3. **Analyze the Duodenum:**
- The duodenum, which is the first part of the small intestine, also secretes mucus. It contains goblet cells in its mucosal layer. These goblet cells produce mucus that helps lubricate the intestinal contents and protect the intestinal lining.

4. **Consider the Large Intestine:**
- The large intestine is another part of the digestive system that secretes mucus. Similar to the duodenum, it contains goblet cells that secrete mucus, which aids in the movement of fecal matter and protects the intestinal walls.

5. **Conclusion:**
- Since mucus is secreted by the stomach, duodenum, and large intestine, the correct answer is that mucus is secreted by all of the above.

**Final Answer:**
Mucus is secreted by the stomach, duodenum, and large intestine.

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