Secretin- a hormone that stimulates basic pancreatic juicesGastrin-a hormone that increases

the production of digestive juicesCholecystokinin- 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 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