Mucosa

• lines mouth, pharynx, esophagus, and anal canal are 


  non - keratinized stratified squamous epithelium
• Lines stomach and intestines


  simple columnar epithelium
• Epithelial tissue is supported by

  lamina propria - contains blood, lymphatic vessels, and mucosa - associated lymphoid tissue (MALT)
• Muscularis mucosa forms

  rugae in stomach and small intestine to increase surface area
• Goblet cells secrete


  mucus for lubrication
• Enteroendocrine cells secrete


  hormones in response of nutrients or pathogens