Section 4: Digestive System

Mucosa artery vein Submucosa Lumen: central cavity Muscularis Serosa nerve supply lymph vessel artery vein

Digestive tract organs Liver Gallbladder Pancreas Digestive tract organs Esophagus Stomach Small intestine Large intestine Rectum Mouth Pharynx Accessory organs Salivary glands Anus

hard palate soft palate uvula tonsil

sphincter relaxes and food enters stomach. hard palate food bolus pharynx soft palate trachea (airway) covered when swallowing Esophagus is closed when breathing. Epiglottis – covers trachea when swallowing Peristalsis esophagus peristaltic wave glottis bolus stomach tongue

Mucosa - has rugae. Muscularis - three layers of muscle. cells that secrete gastric juice esophagus cardiac sphincter pyloric gastric pit gastric gland Gastric glands

Small intestine Section of intestinal wall lumen lymph nodule villus lacteal arteriole lymphatic vessel venule goblet cell blood capillaries

internal anal sphincter external anal sphincter appendix orifice of transverse colon ascending colon descending small intestine cecum anal canal internal anal sphincter external anal sphincter anus sigmoid colon rectum

gallbladder common bile duct duodenum bile common hepatic duct pancreatic duct pancreas pancreatic juice Liver

Digestive Enzymes