A. Mouth = Amylase

C. Gastric = stomachParietal Cells = HClChief Cells = pepsinogenMucus Secreting CellsGastrin Absorption water, some ions, aspirin and ethanol into blood

B. Esophagus = Peristalsisof bolus

Liver = secretes bileBile is stored = Gall Bladder

Pancreas = sodium bicarbonate;Amylase, lipase, trypsin, proteaseChymotrypsin, nucleases, Carboxypeptidase, IsletsOf Langerhans

D. Small Intestine = Digestion absorptionVilli and Microvilli

E. Colon = water and undigested1014 microorganisms; most areCommensals; 50% dry weight ofFeces bacteria

Hormones that control digestion Gastrin (stomach)…stomach acid and pepsinogen

Secretin (small intestine)…Stimulates bicarbonate production in pancreas…neutralize the acidic entering the small intestine.

CCK Cholecystokinin (small intestine)…Bile release from the gall bladder

Regulate appetiteGhrelin …stimulates appetite.

Peptide YY …response to a meal and inhibits appetite

Colon

10.0 L water per day…. 2.0 L from food …. 8.0 liters is from secretions into the gut…. Reabsorbs 95% of that water

Absorbs sodium and other ions Excretes other metallic ions Absorbs vitamin K produced by colon bacteria

Diarrhea can result if water is not absorbed…causing dehydration and ion loss

The last 20 cm of the large intestine is the rectum

Polyps …growths in the epithelial lining of the colon

…benign or malignant

…removed individually

…low-fat, high-fiber diet protection against colon cancer

One Medium-Sized Apple (5 ½ oz/160g)

Calories....................80 Dietary Fiber........5.0 grams Carbohydrate..........18 grams Fat..................0.0 grams Protein..............0.0 grams Cholesterol.............0.0 mg Sodium..................0.0 mg Vitamin C...............6.0 mg Potassium...............170 mg

"An apple a day keeps the doctor away."