Which layer of the digestive tract controls digestive propulsion?

a. serosa
b. mucosa
c. submucosa
d. muscularis externa

D. muscularis externa

Explanation:

The gastrointestinal tract or digestive tract consist of four main layers:

•Mucosa- consists of the epithelium together with glandular tissue and the lamina propria  (connective tissue)

•Submuscosa- consists of fibrous connective tissue with larger blood vessels, lymphatics, nerves..

•Muscularis externa-smooth muscle layer that consists of three layers, responsible for movement (propulsion) and physical break down of the food

•Serosa-consists of connective tissue continuous with the peritoneum.

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if you know your abc's you should be able to get your answer or just use google