Which of these structures is found in the stomach but nowhere else in the alimentary canal? a. a circular muscle layerb. mucus-forming cellsc. a lining of columnar epotheliumd. an onblique muscle layer

d. an onblique muscle layer

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).

idk

explanation:

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.