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  1. Alicia Smoke drew the four layers of the digestive system. She includes a key that consists of glands, lymphatic tissue, arteries, veins, and nerves. The four layers consist of the mucosa, submucosa, muscularis, and serosa.
    The mucosa is a tunic layer or covering for the lumen. The lumen is the space within a tubular structure. The mucosa is made up of three different layers that include epithelium, lamina propria and muscularis mucosae. The epithelium allows for the secretion of mucus, enzymes, and hormones. It is usually simple columnar and mucus screening cells. The lamina propria is made of loose areolar and is rich in capillaries. It also contains lymphoid follicles that defend against microorganisms. Finally, the muscularis mucosae is made of smooth muscle and produces movement.
    The submucosa is made up of areolar tissue, lymphatic vessels, lymphoid follicles and nerves that supply the GI tract. It also contains elastic tissues so organs can reshape.
    The muscularis causes segmentation and peristalsis. It has inner circular muscles and outer longitudinal muscles.
    The final layer is the serosa which is the outer layer. It is made up of visceral peritoneum.
    Each layer is extremely important to complete or protect the function ofthe digestive tract.

    Chloe Chapin

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