THE JOURNEY OF DIGESTIVE SYSTEM - YOUTUBE THE DIGESTIVE SYSTEM

I. OVERVIEW * break down food into small molecules that can be ABSORBED and used by cells in the body * ALIMENTARY CANAL is 9 m long

II. MOUTH * MECHANICAL & CHEMICAL digestion * enzymes in saliva (ex. AMYLASE breaks down starch) * BOLUS - ball of chewed food

III. ESOPHAGUS * PERISTALSIS moves food by muscle contractions (contract & relax)

IV. STOMACH * PEPSIN, HCl acid, & mucus – CHEMICAL digestion * PROTEIN DIGESTION STARTS HERE!!! (add this) * CHYME – THIN, SOUPY LIQUID

V. SMALL INTESTINE * covered w/ VILLI (fingerlike projections lined with capillaries; increases SURFACE AREA) * nutrients absorbed INTO BLOOD (CARBS & PROTEINS) * JEJUNUM, duodenum, & ileum

VI. LARGE INTESTINE * water, cellulose, & other UNDIGESTABLE substances left behind * WATER reabsorbed & VITAMINS absorbed * NO DIGESTION TAKES PLACE!!! * FECES formed – stored in RECTUM - eliminated through ANUS

VII. ACCESSORY ORGANS A. PANCREAS * pancreatic juice w/ENZYMES (pancreatic DUCT delivers to small intestine) * neutralizes STOMACH ACID

B. LIVER * produces BILE (breaks down fats)

C. GALLBLADDER * stores BILE

My X Ray swallows – YouTube Peristaltic Wave in the Gastric Antrum – YouTube Peristalsis... what your insides do that you can't see – YouTube Peristalsis... what your insides do that you can't see – YouTube Peristalsis after a PB &J sandwuch - YouTube

THE EXCRETORY SYSTEM I. OVERVIEW * maintain HOMEOSTASIS by removing WASTE products from the BLOOD, regulate blood VOLUME, & maintain pH

I. SKIN * excrete SWEAT – water, salts, UREA

UREA??? * produced when the liver breaks down protein * average person excretes about 30 grams of urea a day, mostly through urine, but a small amount is also secreted in perspiration * one million pounds of urea is manufactured in the U.S. each year, most of it used in fertilizers * used commercially and industrially to produce some types of plastics, animal feed, glues, toilet bowl cleaners, dish washing machine detergents, hair coloring products, pesticides, and fungicides

II. LUNGS * excrete CARBON DIOXIDE

III. KIDNEYS * blood cleaned & FILTERED (every 45 min. all blood) * URINE = urea, water, & other waste * made up of millions of NEPHRONS - filtration, REABSORPTION, secretion _________  _________  _________  ________ ? 1 of 5 Select this picture Prints best up to 11x14 Why?

Dialysis mathew's story

UROPHAGIA (ewww…gross!!!) * Urophagia is the consumption of urine * Urine, which consists almost entirely of water, is completely sterile when it leaves the body. * auto-urine therapy is said to boost the immune system, cure migraines and other chronic conditions, stave off a cold and work wonders on eyesight problems; can work wonders on skin conditions, such as eczema or psoriasis; can apply it directly for athlete's foot, bee stings and jellyfish stings; you can gargle it for toothache and gum disease. * Bacterial infections of the urinating person's urethra, or disease in the person urinating may pose a risk.