Digestion Overview. I. Picture

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1 I. Picture II. Digestion Overview Organ grouping A. Alimentary canal or gastrointestinal tract ( ) 1. continuous tube mouth to anus ( ) 2. breaks down food, nutrients and wastes 3. organs mouth, pharynx, esophagus, stomach, small intestine, large intestine and anus. B. Accessory organs 1. some are part of GI tract and some are connected to GI tract 2. aid in digestion by chemical and mechanical breakdown of food 3. organs teeth, tongue, salivary glands, liver, gall bladder and pancreas III. Digestive Processes (or the 6 essential activities involved processing food) A. food entering the mouth B. moves food through the GI tract 1. swallowing initiated voluntarily 2. peristalsis a. alternate waves muscular contraction and relaxation of organ walls b. squeezes food to next organ and mixes food C. 1. physically prepares food for chemical digestion 2. includes chewing, mixing food with saliva, churning of stomach and segmentation 3. is rhythmic contractions that mixes food with digestive enzymes and increases efficiency of absorption. D. 1. series of chemical reactions to break down food into their building blocks 2. accomplished by 3. begins in mouth and completed in small intestines E. 1. passage of digested food and water form GI tract to blood 2. most of absorption occurs in small intestine F. 1. elimination of undigested substances form body 2. exits anus in form of feces

2 IV. Nutrients A. Carbohydrates 1. source of energy 2. digestion breaks carbohydrates down into 3. saccharide, disaccharide, polysaccharide B. Lipids 1. source of energy 2. digestion breaks lipids down into and 3. fats, hormones, phospholipids C. Proteinsphotographic pictures 1. source of energy 2. primary function is to build, repair in body 3. digestion breaks proteins down into their 4. enzymes, hormones, connective tissues, blood proteins D. Nucleic acids 1. get DNA and RNA from cells you eat 2. digestion breaks down nucleic acids into 3. DNA is the instructions for life (instructions to make ) E. Vitamins and minerals 1. support specific body functions 2. vitamins A, B, C, D, etc 3. sodium, calcium, potassium, etc F. Water-solvent in which chemical reactions occur V. Functional Concepts of Digestion A. Digestion is controlled by intrinsic and extrinsic means 1. intrinsic nerves in monitor activity and digestion 2. extrinsic nerves from effect digestion B. Digestion provoked by range of stimuli 1. sensors monitor stretchosmolarityphpresence of substrates and products- 2. digestive system reacts to these by activating or inhibiting glands (enzymes) and by speeding or slowing down contents lumen through GI tract

3 VI. Generalized structure of the GI tract A. Layers of the GI tract wall 1. mucosa a. -layer b. typically contains simple columnar epithelium ( ) along with a thin connective tissue layer ( ) and a thin smooth muscle layer ( ) c. functions to (mucus, enzymes, and hormones) and (nutrients into the blood) and (against disease) 2. submucosa a. second layer in from lumen b. connective tissue rich in and 3. muscularis externa a. third layer in from lumen b. functions in propelling food ( ), mixing food in stomach and intestines ( ) c. contains an inner layer of muscles and an outer layer of - muscles d. parts of the inner circular layer thickens to form that act like valves to prevent backflow and control the passage of food to the next organ in the GI tract 4. serosa a. the outermost protective layer of the organs wall b. also called the

4 VII. Serous membrane A. Peritoneum 1. attached to the organs 2. attached to the cavity wall 3. space between visceral and parietal 4. - visceral and parietal layers connected 5. behind peritoneum 6. within peritoneum B. adaptations of the peritoneum 1. = fatty apron a. mesentery that covers abdominal organs b. function - to protect and hold organs in place c. hangs from stomach and transverse colon 2. a. mesentery that suspends the liver from the diaphragm and the ventral wall b. also separates liver into lobes 3. mesentery that suspends stomach from liver 4. mesentery that anchors small intestine to dorsal cavity wall 5. mesentery that anchors large intestine to dorsal cavity wall

5 Organs of the Digestive System I. Mouth or oral cavity A. lined with epithelium B. epithelium slightly keratinized on gums, hard palate and tongue C. review hard palate, soft palate, uvula, fauces D. tongue 1. mixes food with saliva to make a 2. composed of skeletal muscles 3. repositions food during chewing E. salivary glands 1. functions a. mouth b. food to be tasted c. food to become bolus d. contains enzymes which begin to chemically break down of foods 2. names a. gland next to ear b. gland deep in floor of mouth c. gland under tongue F. teeth 1. function - or chew 2. teeth shapes a. incisors chisel-shaped for of pieces b. canines fang-like/ c. premolars and molars rounded for 3. deciduous teeth = milk = baby teeth a. total b. lose them - 6 years 12 years c. 4I, 2C, 4M in upper and lower jaw 4. permanent teeth a. total b. added premolars (bicuspids) and third molar (wisdom teeth) c. 4I, 2C, 4PM, 6M in upper and lower jaw

6 II. Pharynx A. oropharynx to laryngopharynx for food B. passageway for and C. lined with epithelium D. when swallowing, goes up to cover nasal opening and goes down to cover glottis III. Esophagus A. hollow tube about 25 cm (10 inches) long B. located to trachea and serviced by nerve (parasympathetic) C. 3 layers in wall ( ) D. lined with which secretes mucus for lubrication E. sphincters located at each end 1. upper esophageal sphincter 2. lower esophageal sphincter ( ) F. ph optimal for amylase activity ( ) G. esophageal is the opening through the diaphragm H. moves food voluntarily (swallowing = deglutition) and then involuntarily ( ) IV. Stomach A. J-shaped organ which contains all 4 layers of GI tract B. contains = bolus + stomach secretions C. regions 1. entrance of esophagus 2. upper domed portion above cardiac region 3. largest main part 4. narrow distal end of stomach D. sphincters located at each end 1. sphincter esophagus/stomach 2. sphincter stomach/small intestine E. curvatures 1. greater curvature a. lateral side b. longer c. connected to greater 2. lesser curvature a. medial side b. shorter c. connected to lesser

7 F. rugae 1. internal in stomach 2. go away when stomach full G. stomach lining or mucosa 1. epithelium 2. almost entirely lined with goblet cells 3. alkaline ( ) mucus lines stomach to protect it 4. You are what you eat / you don t want to digest yourself H. gastric pits 1. valleys ( ) of mucosa 2. lined with goblet cells I. gastric glands (produce acidic secretions, ph = ) 1. produce gastric juice which is first step in protein digestion 2. 3 regions of gastric gland a. mucus neck cells top of gland - produce mucus b. parietal cells middle of gland, cells produce hydrochloric acid ( ) c. chief cells deepest cells in gland produce 3. function of HCl a. turns inactive pepsinogen into pepsin (HCl) pepsin breaks down proteins into smaller peptides (pepsin) b. provides optimal ph for pepsin to work (ph = ) c. denatures d. destroys

8 V. Small Intestine A. General 1. Digestion and absorption will be completed here but all enzymes found here. 2. Called small, not because of its length, (20 23 feet), but because of its. 3. epithelium lining B. Regions 1. Duodenum a. first section, about 1 foot long b. retroperitoneal c. wall is only 3 layers thick because no d. hepatopancreatic ampulla opening for secretions from and 2. jejunum a. middle 8 feet 3. Ileum a. distal 12 feet b. joins to large intestine C. Modifications of mucosa 1. plicae circulares (or circular folds) a. folds or plates spiral down small intestine ( ) b. function to increase for absorption 2. Villi a. fingerlike projections of mucosa b. function to increase for absorption 3. Microvilli a. on villi, they are projections into lumen b. function is to increase for absorption c. also called brush border 4. Peyers patches a. lymphatic nodes in ileum b. help prevent from entering bloodstream

9 D. Secretions of small intestine 1. goblet cells produce mucus for from stomach acidic chyme 2. duodenal glands - produce basic or alkaline mucus to chyme 3. intestinal glands or crypts secrete intestinal juice to water down chyme and help carry nutrients to be 4. mucosal enzymes (or brush border enzymes) a. produced on of mucosa b. found on on intestine, not in chyme c. optimum ph,, for intestinal and pancreatic enzymes d. peptidases reduce peptides to pepsin peptidases e. disaccharidases reduce diasaccharides to monosaccharides amylase disaccharidases f. nucleases reduces nucleic acids to nucleotides nuclease g. enterokinase used to pancreatic enzymes E. Functions of small intestine 1. receive chyme a. when enters small intestine b. when exits small intestine 2. propulsion of chyme 3. churning of chyme 4. completes digestion 5. absorption of nutrients 6. secrete which regulate digestion 7. accessory organ attach here: liver gall bladder, pancreas

10 VI. Large Intestine A. regions (most have simple columnar epithelium lining ) 1. cecum first part of large intestine a. ileoceceal sphincter connect small to large intestine b. connects to 2. colon (4 parts) water to concentrate feces a. ascending colon b. transverse colon c. descending colon d. sigmoid colon 3. rectum ( ) storage of feces 4. anal canal tapered end of rectum a. numerous veins weakened, dilated veins = b. muscular sphincters: circular muscles i. internal sphincter ( ) smooth muscle - urgency ii. external sphincter ( ) skeletal muscle - hold in feces or gas c. epithelium i. upper anal canal same as intestines, simple columnar ii. lower anal canal stratified squamous 5. anal orifice - B. characteristics 1. teniae coli longitudinal muscle that pulls and puckers large intestine 2. haustia puckers that form are called teniae coli 3. epiploic appendages fat filled sacks on visceral peritoneum 4. diarrhea chyme rushed through large intestine - less reabsorption of water 5. constipation chyme slowed in large intestine - too much reabsorption of water

11 VI. Pancreas A. anatomy 1. location to stomach next to curve of duodenum 2. structure a. largest, most medially located b. middle, elongated c. thinning, lateral end d. hepatopancreatic ampulla junction to duodenum e. pancreatic duct+common bile duct = hematopancreatic duct B. secretions of pancreas 1. all enzymes secreted are in an form until they reach duodenum (pro- or ogen) 2. pancreas is only organ that makes enzymes for categories of organic molecules 3. pancreatic enzymes are in small intestine (as opposed to small intestine enzymes which are stuck to the walls) 4. secretions are both exocrine and endocrine a. endocrine contains cells that produce i. insulin causes reduction of blood sugar levels ii. glucagon causes elevation of blood sugar levels b. exocrine secretes digestive i. protein digesting enzymes trypsinogen to trypsin chymotrypsinogen to chymotrypsin procarboxypeptidase to carboxypeptidase *Enterokinase activates trypsinogen to trypsin in small intestine. Trypsin activates others. ii. nucleic acid digesting enzymes nucleases reduces nucleic acids to iii. carbohydrate digesting enzymes - pancreatic amylase converts polysaccharides to disaccharides, (amylase works only 10 seconds) iv. lipid digesting enzymes ( ) lipase lipids monoglycerides and fatty acids v. bicarbonate ion helps neutralize chyme to optimum ph ( )

12 VI. LIVER (Hepar) A. location and description 1. upper right quadrant of abdominopelvic cavity 2. partially fused to diaphragm ( ) 3. surfaces a. diaphragmatic surface b. visceral surface 4. 4 lobes 5. porta hepatis = hilus of liver a. portal vein i. blood going liver from intestines, stomach, pancreas, and spleen ii. 80% of blood going into liver is venous b. hepatic artery i. blood going liver branching from aorta ii. 20% of blood entering liver is good clean blood c. common hepatic duct i. bile liver ii. eventually joins cystic duct (gall bladder) to form common bile duct. Common bile duct connects to pancreatic duct to form hepatopancreatic duct B. functions 1. maintain levels a. too much sugar glycogenesis = convert glucose to glycogen b. not enough sugar glycogenolysis = reduce glycogen to glucose 2. store minerals and 3. protect body a. detoxify drugs (legal or illegal) b. take 3 times daily c. phagocytosis by Kupffer cells 4. makes - blood proteins and clotting factors 5. makes 6. excretion a. (heme without Fe + ) b. (byproduct from protein catabolism)

13 C. hepatic partal system 1. portal = generally means veins to capillaries to veins 2. primary capillaries (intestines, stomach, pancreas, and spleen) portal veins secondary capillaries (in liver called sinusoids) hepatic vein inferior vena cava D. microscopic structure of liver 1. lobule a. shape of b. central vein in middle - c. triad at corners i. bile in from lobule ii. blood to lobule iii. blood to lobule d. blood flows from perimeter of lobule to center vein ( ) e. blood is filtered as it goes through lobule ( )

14 VII. Gall Bladder A. hollow sac found on surface of liver to store bile B. smooth muscle in wall vigorous contractions C. serviced by cystic duct 1. dilute bile in 2. concentrated bile out VIII. Bile A. contents - water, electrolytes, bilirubin, bile salts (no enzymes) B. bile salts 1. to break up fat globule 2. orient toward water - face out from fat 3. orient toward fat - causing emulsification 4. large fat globule broken down into small fat droplets 5. to assist lipase by increasing surface area 6. if too concentrated, bile forms gallstones

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