Arrange the following parts of alimentary canal in sequence from outerto inner
A. Mucosa B. Submucosa
C. Serosa
D. Longitudinal muscles
E.Circular muscles

Options

A. ABCDE
B. CDEBA
C. BCDAE
D. ACDEB

Answer

To arrange the parts of the alimentary canal in sequence from outer to inner, we need to understand the structure of the walls of the alimentary canal. The layers from outermost to innermost are as follows:

1. **Serosa (C)**: This is the outermost layer of the alimentary canal. It is made up of a thin layer of mesothelium and some connective tissue.

2. **Longitudinal Muscles (D)**: Beneath the serosa, the muscularis layer consists of smooth muscle. The outer layer of this muscularis is the longitudinal muscles.

3. **Circular Muscles (E)**: Inside the longitudinal muscles, we have the circular muscles, which are arranged in a circular manner around the canal.

4. **Submucosa (B)**: This layer is made up of loose connective tissue and contains blood vessels, nerves, and lymphatic vessels. It lies beneath the muscularis layer.

5. **Mucosa (A)**: The innermost layer is the mucosa, which is responsible for the secretion of digestive enzymes and absorption of nutrients. It has irregular folds in the stomach (rug) and finger-like projections (villi) in the small intestine.

Thus, the correct sequence from outer to inner is:
C (Serosa) → D (Longitudinal Muscles) → E (Circular Muscles) → B (Submucosa) → A (Mucosa).

### Final Arrangement:
1. C - Serosa
2. D - Longitudinal Muscles
3. E - Circular Muscles
4. B - Submucosa
5. A - Mucosa