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NOTES – DIGESTIVE SYSTEM ANATOMY

NOTES – DIGESTIVE SYSTEM ANATOMY. Interesting Digestive System Facts. After you eat how long does it take for the stomach to empty?. Within 2-6 hours, all food is emptied into the small intestine. How many pounds of food does the average person eat in a year?. 1,100.

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NOTES – DIGESTIVE SYSTEM ANATOMY

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  1. NOTES – DIGESTIVE SYSTEM ANATOMY

  2. Interesting Digestive System Facts After you eat how long does it take for the stomach to empty? Within 2-6 hours, all food is emptied into the small intestine.

  3. How many pounds of food does the average person eat in a year? 1,100

  4. How many feet long are your intestines? about 20-30 ft long.

  5. NOTES – DIGESTIVE SYSTEM ANATOMY • Oral Cavity • mouth, pharynx, esophagus

  6. MOUTH • SALIVARY GLANDS – produce saliva

  7. Saliva Components • Mostly water – about 99.5% • SALIVARY AMYLASE – digests starch • LYSOZYME – antibacterial action • MUCIN – lubricant • chewing and saliva with food form a BOLUS

  8. PHARYNX • common area for food and air • prevents food from entering the trachea (wind pipe) • Epiglottis

  9. ESOPHAGUS • transports bolus from pharynx to stomach • involuntary muscular movement of food - PERISTALSIS

  10. STOMACH • a storage & mixing chamber • secretions • mucus • hydrochloric acid (HCl) • HCl activates pepsinogen to pepsin which is main enzyme that digests protein

  11. movement • mixing waves - peristalsis • bolus becomes chyme

  12. SMALL INTESTINE • parts: duodenum, jejunum, ileum • Function: • digestion and absorption • intestinal juice – water & mucus • epithelial cells have digestive enzymes to digest ALL classes of food

  13. LIVER • performs many functions – main blood filter in digestive system • in digestion it secretes BILE into the gall bladder • the gall bladder then dumps bile into small intestine

  14. bile EMULSIFIES fats – breaks fat into smaller pieces – easier for fat digesting enzymes to do their work Normal liver fatty liver Cirrhosis of the liver

  15. PANCREAS • pancreatic enzymes are important for the digestion of all major classes of food • four enzymes and bicarbonate • all are dumped into small intestine

  16. LARGE INTESTINE • Parts: ascending colon, transverse colon, descending colon, sigmoid colon • chyme is converted to feces • absorption of water & salts • E. coli bacteria synthesizes vitamin K

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