Peristaltic movements found in different parts of alimentary canal In which one of these there is least peristalsis-

Options

A. Stomach
B. Duodenum
C. Rectum
D. Oesophagus

Answer

To determine which part of the alimentary canal exhibits the least peristalsis, we can analyze the peristaltic movements in different sections of the canal. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand Peristalsis
Peristalsis is a series of wave-like muscle contractions that move food through the digestive tract. It occurs in various parts of the alimentary canal, including the esophagus, stomach, small intestine, and large intestine.

**Hint:** Remember that peristalsis is crucial for moving food and waste through the digestive system.

### Step 2: Analyze Each Option
1. **Stomach**: The stomach has strong peristaltic movements that mix and propel food towards the small intestine. Therefore, it does not have the least peristalsis.

**Hint:** Consider how food is processed in the stomach and the need for movement.

2. **Duodenum**: The duodenum, the first part of the small intestine, also exhibits peristaltic movements to mix food with digestive juices and move it further along the digestive tract. Thus, it is not the correct answer.

**Hint:** Think about the role of the duodenum in digestion and absorption.

3. **Rectum**: The rectum is part of the large intestine where feces are stored. While there are some peristaltic movements in the large intestine, the rectum primarily serves as a storage area for undigested food in the form of feces. Therefore, it has the least peristalsis compared to other parts of the alimentary canal.

**Hint:** Reflect on the function of the rectum and how it differs from other sections in terms of movement.

4. **Esophagus**: The esophagus has significant peristaltic movements that help push food down into the stomach. Thus, it does not have the least peristalsis.

**Hint:** Consider the esophagus's role in transporting food from the mouth to the stomach.

### Step 3: Conclusion
After analyzing all the options, the rectum is identified as the part of the alimentary canal with the least peristalsis. This is because its primary function is to store fecal matter rather than actively move it.

**Final Answer:** The rectum has the least peristalsis.