the digestive system

the digestive system

1. organs

   • salivary gland
     • parotid gland
     • sublingual gland
     • submandibular gland
   • stomach
   • pancreas
   • liver
   • gallbladder
   • small intestine
     • duodenum
     • jejunum
     • ileum
   • large intestine
     • transverse colon
     • descending colon
     • ascending colon
     • cecum
     • sigmoid colon
     • rectum
     • appendix
     • anal canal

2. 9m long

3. six processes

   • ingestion
   • propulsion
   • mechanical digestion
   • chemical digestion
   • absorption
   • defectation

4. the layers of the GI tract

   • muscularis externa
     • responsible for motility of GI tract
     • made up of circular and logintudional muscle
   • submuscosa
     • contains large blood vessels and lymphatic vessels
   • serosa
     • outermost layer
   • mucosa
     • secretion of mucus
     • absorption of digestive products
     • immune protection
     • surface epithelium
     • lamina propria
     • muscularis mucosae