Question

question 14
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the contractions of which layer promotes mechanical digestion, exposes more of the food to digestive chemicals, and moves the food along the canal?
mucosa
serosa
muscularis
submucosa
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Explanation:

The muscularis layer consists of smooth muscle. Its contractions (peristalsis and segmentation) are responsible for mechanical digestion (like breaking food into smaller pieces via segmentation), exposing food to digestive chemicals (as the movement helps mix food with enzymes), and moving food along the digestive canal (peristalsis propels food forward). The mucosa is involved in secretion and absorption, the serosa is a protective outer layer, and the submucosa contains blood vessels and nerves but not the muscle for the described movements.

Answer:

Muscularis