Question

Which of these structures is found in the stomach but nowhere else in the alimentary canal?

A. an oblique muscle layer
B. a lining of columnar epithelium
C. a circular muscle layer
D. mucus-forming cells

Answer 1

A. an oblique muscle layer

Step-by-step explanation:

The alimentary canal has four main layers:

Mucosa (innermost layer which surrounds the lumen), submucosa (connective tissue with blood vessels, lymphatics, and nerves), muscular layer, serosa ( outermost layer of connective tissue).

Muscular layer is subdivided into:

• the inner- arranged in circular rings, prevents food from travelling backward

• outer layer- arranged longitudinally, shortens the tract.

The stomach has an extra layer called inner oblique muscular layer (churning function).