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Digestive system (Anatomy (Layers (Mucosa (Produce mucus, secretions, use…

- - - - Produce mucus, secretions, use enzymes, hormones, mucus. Absorb of food, protection from foreign invaders
    - - Under mucosa, contains blood vessels, nerve fibers, lymphatic vessels, lymph nodes,(epithelial tissue)
    - - smooth muscle, move food, mix digested food into smaller pieces
    - - visceral peritoneum outermost layer, connective tissue binds organs to surrounding tissues
  - - - exocrine glands secrete saliva. of mucus and a thin watery substance. amylase =enzyme breaks dowm carbohydrates.
      - Parotids
        
        largest, beneath the ears, release saliva in upper molar region of mouth
      - Submandibulars
        
        below the mandible back, release saliva in lower molar region in the mouth
      - Sublinguals
        
        release saliva below tongue in the front, parotid gland tendency to flare cause swelling.
    - - 3 layers
        
        CROWN
        
        top of the tooth, enamel, calcium salts, crown beneath the gingiva
        
        dentin, yellowish in color hard substance.continues down into the root of the tooth and is imbedded in the bone of the maxilla and mandible.
        
        NECK
        
        ROOT
      - Pulp
        
        middle layer,blood vessels and nerves
      - 32 teeth in an adult's mouth
      - front 8 teeth are called the incisors
        
        cutting/tearing
      - 4 cuspids
        
        pointed for tearing
      - 8 bicuspids or premolars
      - 12 molars
        
        chew into smaller peices
  - - - Cardiac
        
        1st part of the stomach food enters cardiac sphincter. (doesn't close fully heartburn)
      - Fundus
        
        dome shape between cardiac region and body
      - Body
        
        largest region
        
        3 layers of smooth
        
        oblique=allows to be mixed.
      - Pylorus
        
        end, pyloric sphincter
        
        regulates to small intestines