NOTES – DIGESTIVE SYSTEM ANATOMY. Within 2-6 hours, all food is emptied into the small intestine....
-
Upload
jennifer-lane -
Category
Documents
-
view
218 -
download
2
Transcript of NOTES – DIGESTIVE SYSTEM ANATOMY. Within 2-6 hours, all food is emptied into the small intestine....
Within 2-6 hours, all food is emptied into the small intestine.
After you eat how long does it take for the stomach to empty?
Interesting Digestive System Facts
• Saliva Components
• Mostly water – about 99.5%
• SALIVARY AMYLASE – digests starch• LYSOZYME – antibacterial action• MUCIN – lubricant
• chewing and saliva with food form a BOLUS
• PHARYNX
• Epiglottis • prevents food from entering the trachea (wind pipe)
• common area for food and air
• ESOPHAGUS
• transports bolus from pharynx to stomach
• involuntary muscular movement of food - PERISTALSIS
• STOMACH • a storage & mixing chamber
• secretions • mucus
• hydrochloric acid (HCl)• HCl activates pepsinogen to pepsin which is main enzyme that digests protein
• 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
• 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
• 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
• PANCREAS
• pancreatic enzymes are important for the digestion of all major classes of food• four enzymes and bicarbonate• all are dumped into small intestine