Question

The innermost layer of alimentary canal is called _____
(a) Serosa
(b) Mucosa
(c) Sub-mucosa
(d) Muscularis

Answer 1

Answer:

Mucosa

Explanation:

There are four layers in alimentary canal. all of them are explained below (innermost layer to outermost layer)

1) Mucosa

This layer secretes digestive enzymes, hormones and mucous. it protects against all the infections and it absorbs products of digestion into the blood

2) Sub Mucosa

This layer is a connective tissue consisting of blood vessels and lymphatic vessels.

3) Muscularis

This layer is responsible for peristaltic movements which helps the food particles move through the alimentary canal.

4) Serosa

This tissue is made up of areolar connective tissue covered by single layer of squamous epithelial cells.

Answer 2

The innermost layer of alimentary canal is called Mucosa.

Option: (b)

Explanation:  

• Throughout most of the alimentary canal, there are four layers of tissue. The outermost tissue is the serosa. Following it is the muscles.

• Then inner to it is the submucosa. The submucosa may contain Brunner glands in the intestine. The outer most layer the mucosa.

• The mucosa mainly contains the glands of the alimentary canal associated with digestion.

• Furthermore the mucosa has finger-like extension known as the villi.

• The villi extend the ‘surface area’ for the absorption of the food and are present in the ‘small intestine’.