Digestive System Organs Which structure is first?

1.Mouth/Oral Cavity receives food Mechanical digestion by teeth mixes food w/saliva to form bolus

Salivary Glands Accessory organ, begins chemical digestion of carbohydrates Secretions- –Saliva –Salivary amylase-splits starch into disaccharides –Lysozyme –Lingual lipase

2.Pharynx Primary organ- passageway for food, liquid, and air Fxn- swallowing

3. Esophagus Primary organ (25cm) Location- ________ cavity, upper L Food passes through, peristalsis Sphincter- 1 st -Lower esophageal sphincter (cardiac sphincter)

4. Stomach Primary Organ (6-7 in.) J-shaped, mixes food w/ gastric juice Initiates protein digestion (Sm. amounts absorbed here) Sphincter –pyloric sphincter

4. Stomach (cont.) –Makes chyme- 4 regions- Draw PIC Secretions- –Gastric juice- Mucous HCl- Enzymes- –Pepsin- –Gastric lipase- Hormone- –Gastrin-

Pancreas Accessory organ Attached to duodenum Produces enzymes which break down all categories of food Secretions- –Pancreatic juice Enzymes- –Pancreatic amylase –Pancreatic lipase –Trypsin, chymotrypsin, carboxy-peptidase

Pancreas (cont.) Hormones Secreted by the Pancreas –Glucagon- Hypoglycemia- –Insulin- Hyperglycemia-

5. Small Intestine Primary organ- 6m Abdominal cavity carbohydrate, lipid, protein digestion 3 parts- 1. Duodenum ( from stomach, bile and pancreatic duct here, 25cm) 2. Jejunum- 2.5 m folds 3. Ileum- 3.5m to lg. intestine Sphincter –ileocecal sphincter

5.Small Intestine (cont.) Secretions- –Receives pancreatic juice –Mucous –Enzymes- Sucrase, maltase, lactase- Intestinal lipase- Peptidases-

Absorption in Small Intestine Villi- small projections increase surface area for absorption Completes nutrient absorption

Name of Enzyme Organ that secretes the enzyme Organ that receives the enzyme Function (It breaks ____ into ______. Salivary Amylase

Upcoming Events Enzyme Chart-due tomorrow (Friday) Digestive Essay-due Wednesday –We will have class on Wednesday (PSAT day) Digestive System Quiz-Thursday

You will need: Your enzyme chart Blue, orange, yellow, red and green (or five other colors) Instructions (Make a KEY!): –Underline the name of any NUTRIENT orange –Underline the name of any MACROMOLECULE yellow –Shade the box blue if it names an enzyme that assists in carbohydrate digestion –Shade the box green if it names an enzyme that assists in protein digestion –Shade the box red if it names an enzyme that assists in lipid digestion

Liver Accessory Organ Upper abdomen Break up fat so enzymes can digest it Secretions- –Bile/bile salts- Other Fxns- –Detoxification- –Metabolism- –Storage

Gallbladder Accessory organ Behind liver, connects to sm. intestine Fxn- storage room for bile Sphincter –Hepatopancre- atic sphincter

6. Large Intestine Primary organ 1.5 m long Abdominopelvic cavity, surrounds small intestine Absorbs water, minerals, and electrolytes Forms and stores feces AKA-colon

6. Large Intestine (cont.) 5 parts- –Cecum-pouch below ileocecal opening, appendix attaches here –Ascending colon- –Transverse colon –Descending colon –Sigmoid colon-

7. Rectum & 8. Anus Primary organs Pelvic cavity Fxn- peristalsis, final storage spot, “creates urge”, defecation Sphincters- –Internal anal sphincter –External anal sphincter