Secretin- a hormone that stimulates basic pancreatic juices Gastrin-a hormone that increases the production of digestive juices Cholecystokinin- a hormone that stimulates digestive pancreatic juices and bile release Pepsin-an enzyme that digests proteins Amylase-an enzyme that digests carbohydrates Lipase- an enzyme that digests lipids

Digestive System Does anyone read this?

Outline Week One Week Two Diagrams & layers of digestive system Tongue, palate, teeth & salivary glands Pharynx, esophagus, stomach Pancreas, liver, gallbladder & intestines Week Two Diseases and treatments Clinical Rounds Review TEST (MARCH 1st!)

Gallbladder, Liver and Pancreas No food goes through these Secretions  ducts  S.I. Food that enters the small intestine from the stomach is called chyme (an acidic paste)

Pancreas Makes digestive juices for organic compounds Lipase, cholecystokinin & nuclease Secretin stimulates basic solution to reduce pH of chyme

Liver Versatile organ! Tiny units called hepatic lobules Secretes bile  hepatic duct Lipid digestion Other roles: creates phospholipids, cholesterol, filters blood, turns carbs to fats, makes parts of blood, stores iron/vitamins, filters toxins

Gallbladder Overflow storage site for bile Release of bile controlled by cholecystokinin

The intestines

Peristalsis Rhythmic movement of muscles that moves food through the large and small intestines

Small Intestine Chyme here Three parts Duodenum Ilium Jejunum Coated with villi to increase SA

Small Intestine’s Role Finish digestion Absorb nutrients Move food remains to large intestines Secrete watery fluid to help absorb digested nutrients Note: If food is rushed through small intestines, there will be low nutrient absorption, increased defecations & diarrhea

Large Intestine Absorb water & electrolytes Three parts Cecum Colon Rectum

Magic School Bus! Name as many components of their trip that you recognize as part of the digestive unit These can be facts you thought of, names or functions of structures, etc.

Activity Trace the path of a piece of food through the digestive system. List the sites that you see (in order) and what is occurring there.

Flashcards Hormones: gastrin, cholecystokin, secretin (other side is what organs they effect and what it makes they secrete). Enzymes: Lipase, amylase, nuclease, bile salts, pepsin