Muscular contractions of alimentary canal are

Options

A. Circulation
B. Deglutition
C. Churning
D. Peristalsis

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the muscular contractions of the alimentary canal. We need to identify the process responsible for these contractions.

2. **Identifying the Options**: The options provided are:
- A) Circulation
- B) Deglutition
- C) Churning
- D) Peristalsis

3. **Defining the Alimentary Canal**: The alimentary canal is a tube-like structure that extends from the mouth to the anus. It is responsible for the digestion and movement of food through the digestive system.

4. **Analyzing Each Option**:
- **A) Circulation**: This refers to the movement of blood throughout the body, not the movement of food in the alimentary canal.
- **B) Deglutition**: This is the act of swallowing, which is a specific action that occurs in the mouth and does not describe the overall movement of food through the entire canal.
- **C) Churning**: This refers to the mixing of food, particularly in the stomach, but does not encompass the entire process of moving food through the digestive system.
- **D) Peristalsis**: This is the rhythmic, wave-like contraction and relaxation of the muscles in the alimentary canal that propels food along the digestive tract.

5. **Conclusion**: Based on the definitions and functions of each term, the correct answer is **D) Peristalsis**. This process is essential for moving food through the entire length of the alimentary canal.