What is the major type of involuntary movement of the GI tract?


What is the major type of involuntary movement of the GI tract?

Histological Layers of the Alimentary Canal:

Starting at the lumen of the alimentary, the general arrangement in the alimentary tract is as follows:

  1. The mucosa (composed of a lining epithelium, an underlying lamina propria, and a thin muscularis mucosa).
  2. The submucosa (a layer of loose connective tissue that contains blood vessels, nerves, mucous glands, and lymphatic tissues).
  3. The muscularis propria (two layers of smooth muscle, with the inner layer being arranged circularly and the outer layer being arranged longitudinally).
  4. The adventitia (the outermost layer of connective tissue that is covered by the visceral peritoneum).

Answer and Explanation: 1

Peristalsis is the major type of involuntary movement in the GI tract. The muscularis propria, two layers of smooth muscle sitting outside the submucosa, is responsible for peristalsis.

Learn more about this topic:

Movement Through the Small Intestine: Peristalsis, Segmentation & Pendular Movement


Chapter 17 / Lesson 5

Understand small intestine segmentation. Explore the secretions, contractions, and movements of small intestines. Discover peristalsis and pendular movements.

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