WARM UP 1.List 3 locations you might find epithelial tissue. 2.Describe how/why epithelial tissue is important in each of the locations you listed.

Digestive System

General Structure Digestive tract –Tube from mouth to anus Lined with epithelium

General Structure Accessory organs –Secrete substances into d.t. Cuboidal epithelium

General Function Mechanical processing –Segmentation into small pieces Secretion of enzymes Digestion –Chemical break-down to simple nutrients

General Function Absorption –Nutrients to blood Elimination –Unabsorbed waste

Digestive Structure and Function Mouth (dt) –Chewing (mp) Salivary glands (ao) –Release saliva (se/d) Moistening and carbohydrate digestion –Salivary amylase (se)

Digestive Structure and Function Pharynx (dt) –Pulls food in (mp) Esophagus (dt) –Moves and moistens (mp)

Digestive Structure and Function Stomach (dt) –Stores and breaks up food (mp) Rugae –Hydrochloric acid and pepsin (se / d) Protein –Water, minerals absorbed

Digestive Structure and Function Liver and Gallbladder (ao) –Make and send bile down bile duct (se)

Digestive Structure and Function Pancreas (ao) –Many enzymes sent down pancreatic duct (se)

Digestive Structure and Function Small Intestine (dt) –Duodenum Mixes fluids from stomach, pancreas, gallbladder (mp)

Digestive Structure and Function Small Intestine (dt) –Jejunum Digests carbohydrates (amylase), proteins (peptidase), fats (bile) Absorbs all nutrients –Villi for surface area

Digestive Structure and Function Small Intestine (dt) –Ileum Some absorption

Digestive Structure and Function Large intestine/Colon (D.T.) –Ascending, Transverse, Descending, Sigmoid –Absorbs water and minerals –Concentrates undigested matter (e) Fiber

Digestive Structure and Function Rectum (D.T.) –Pressure builds –Contracts to expel feces (e) Anus (D.T.) –End of system

WRAP UP Describe how the structure of the small intestine allows absorption to happen as efficiently as possible.

WARM UP 1.List the 3 major nutrients that we digest, and name an enzyme that digests each of them.

WRAP UP List at least 5 organs food passes through as it is being digested, in the correct order.