Biology - Digestion and Absorption Question with Solution | TestHub
The given diagram represent the T.S. of gut. Identify a, b and c.
Options:
Answer:
Solution:
The wall of the alimentary canal from the oesophagus to the rectum possesses four layers. From outer to inner, these are:
1.Serosa: It is the outermost layer and is made up of a thin mesothelium (epithelium of visceral organs) with some connective tissues. In the given diagram, 'a' represents the serosa.
2.Muscularis: It is formed by smooth muscles usually arranged into an inner circular and an outer longitudinal layer.
3.Submucosa: It is formed of loose connective tissues containing nerves, blood, and lymph vessels. In the given diagram, 'b' represents the submucosa, as it contains a blood vessel.
4.Mucosa: It is the innermost layer lining the lumen of the alimentary canal. This layer forms irregular folds (rugae) in the stomach and small finger-like foldings called villi in the small intestine. In the given diagram, 'c' represents the mucosa.
Therefore, a - Serosa, b - Submucosa, c - Mucosa.
Answer: a - Serosa, b - Submucosa, c - Mucosa
