The Digestive System
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Transcript of The Digestive System
![Page 1: The Digestive System](https://reader036.fdocuments.net/reader036/viewer/2022081413/5463ffb8af7959f6118b66f0/html5/thumbnails/1.jpg)
CH. 5: T
HE DIG
ESTIVE
SYSTEM
BY
: RO
S AL
I ND
LA
ND
LE
S S , KA
TH
RY
N R
ES P I C
I O &
P RI S C
I LL
A R
I VA
S
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CHAPTER GOALS
• Name the organs of the digestive system and describe their locations.
• Define combining forms for organs and know the meaning of related terminology.
• Describe signs, symptoms and disease conditions affecting the digestive system.
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INGESTION AND DIGESTION
• Ingestion – food materials taken into the mouth
• Digestion – food is broken down, mechanically and chemically, as it travels through the gastrointestinal tract.
Digestive enzymes aid the breakdown of complex nutrients.
Proteins → amino acidsSugars → glucoseFats → fatty acids or triglycerides
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ABSORPTION
• Digested food passes into the bloodstream through lining cells of the small intestine.
• Nutrients travel to all cells of the body.
• Cells burn nutrients to release the energy stored in food.
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ELIMINATION
• The body eliminates solid waste materials that cannot be absorbed into bloodstream.
• The large intestine concentrates feces.
• The wastes pass out of the body through the anus.
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THE DIGESTIVE TRACT
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PATHOLOGY OF THE DIGESTIVE SYSTEM
Signs and symptoms• Anorexia – lack of appetite
• Ascites – abnormal accumulation of fluid in the abdomen
• Borborygmus (plural: borborygmi) – rumbling or gurgling noise produced by the movement of gas, fluid, or both in the GI tract
• Constipation – difficulty in passing stools
• Diarrhea – frequent passage of loose, watery stools
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PATHOLOGY OF THE DIGESTIVE SYSTEM
• Dysphagia – difficulty in swallowing
• Eructation – gas expelled from the stomach through the mouth
• Flatus – gas expelled through the anus
• Hematochezia – passage of fresh, bright red blood from the rectum
• Jaundice (icterus) – yellow-orange coloration of the skin and whites of the eyes caused by high levels of bilirubin in the blood
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PATHOLOGY OF THE DIGESTIVE SYSTEM
• Melena – black, tarry stools; feces containing digested blood
• Nausea – unpleasant sensation in the stomach associated with a tendency to vomit
• Steatorrhea – fat in the feces; frothy, foul-smelling fecal matter
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ORAL CAVITY
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ORAL CAVITY
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ORAL CAVITY
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ORAL CAVITY: SALIVARY GLANDS
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PHARYNX: DEGLUTITION
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PATHOLOGIC CONDITIONS: ORAL CAVITY AND TEETH
• Aphthous stomatitis – inflammation of the mouth with small, painful ulcers
• Dental caries – tooth decay
• Herpetic stomatitis – inflammation of the mouth by infection with the herpes virus
• Oral leukoplakia – white plaques or patches
• Periodontal disease – inflammation and degeneration of the gums, teeth and surrounding bone
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PATHOLOGICAL CONDITIONS: UPPER GASTROINTESTINAL TRACT
• Achalasia – failure of the lower esophagus sphincter (LES) muscle to relax
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PATHOLOGICAL CONDITIONS:UPPER GASTROINTESTINAL TRACT
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PATHOLOGICAL CONDITIONS:UPPER GASTROINTESTINAL TRACT
• Esophageal cancer – malignant tumor of the esophagus
• Esophageal varices – swollen, varicose veins at the lower end of the esophagus
• Gastric carcinoma – malignant tumor of the stomach
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PATHOLOGICAL CONDITIONS:UPPER GASTROINTESTINAL TRACT
Gastroesophageal reflux disease (GERD) – solids and fluids return to the mouth from the stomach
Peptic ulcer – open sore or lesion of the mucous membrane of the stomach or duodenum
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PATHOLOGICAL CONDITIONS:UPPER GASTROINTESTINAL TRACT
• Hernia – protrusion of an organ or part through the muscle normally containing it
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QUICK QUIZ:
3. Which terms means swallowingA. MasticationB. DeglutitionC. EmulsificationD. Peristalsis
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PARTS OF THE STOMACH
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SMALL INTESTINE
Villi in the lining of the small intestine
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LARGE INTESTINE
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PATHOLOGICAL CONDITIONS: LOWER GASTROINTESTINAL TRACT
[Small and Large Intestines]
• Anal fistula – abnormal tube-like passageway near the anus
• Colonic polyposis – polyps protrude from the mucous membrane of the colon
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PATHOLOGICAL CONDITIONS:LOWER GASTROINTESTINAL TRACT
Colorectal cancer – adenocarcinoma of the colon or rectum or both
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PATHOLOGICAL CONDITIONS:LOWER GASTROINTESTINAL TRACT
• Crohn disease – chronic inflammation of the intestinal tract
• Diverticulosis – abnormal side pockets (outpouchings) in the intestinal wall
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PATHOLOGICAL CONDITIONS:LOWER GASTROINTESTINAL TRACT
• Dysentery – painful, inflamed intestines
• Hemorrhoids – swollen, twisted, varicose veins in the rectal region
• Ileus – failure of peristalsis with resulting obstruction of the intestines
• Inflammatory bowel disease (IBD) – inflammation of the colon and small intestine
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PATHOLOGICAL CONDITIONS:LOWER GASTROINTESTINAL TRACT
• Intussusception – telescoping of the intestines
• IBS – irritable bowel syndrome – group of gastrointestinal symptoms associated with stress and tension
• Ulcerative colitis – chronic inflammation of the colon with the presence of ulcers
• Volvulus – twisting of the intestines on itself
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QUICK QUIZ:
2. Which term is the first part of the large intestine?A. CecumB. DuodenumC. JejunumD. Pylorus
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LIVER, GALLBLADDER & PANCREAS
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LIVER, GALLBLADDER & PANCREAS
The pancreas and its functions
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LIVER, GALLBLADDER & PANCREAS
Besides producing bile, the liver:• Helps maintain normal blood
glucose levels• Manufactures blood proteins
necessary for clotting• Releases bilirubin, a pigment in
bile• Removes toxins and poisons from
the blood
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PATHOLOGICAL CONDITIONS:LIVER, GALLBLADDER & PANCREAS
Cholelithiasis – gallstones in the gallbladder
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PATHOLOGICAL CONDITIONS: LIVER, GALLBLADDER & PANCREAS
• Cirrhosis – chronic degenerative disease of the liver
• Pancreatic cancer – malignant tumor of the pancreas
• Pancreatitis – inflammation of the pancreas
• Viral hepatitis – inflammation of the liver caused by a virus
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QUICK QUIZ
1. What happens if bilirubin cannot leave the body and remains in the bloodstream?
A. GluconeogenesisB. EmulsificationC. HyperbilirubinemiaD. Glycogenolysis
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FOOD PATHWAY THROUGH THE GI TRACT
Food enters through the oral cavity and exits through the anus.
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VOCABULARY
absorption
amino acids
amylase
anus
Passage of materials through the walls of the small intestine into the bloodstream
Small building blocks of proteins; released when proteins are digested
Enzyme secreted by the pancreas and salivary glands to digest starch
Terminal end or opening of the digestive tract to the outside of body
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VOCABULARY
appendix
bile
bilirubin
bowel
Blind pouch hanging from the cecum
Digestive juice made in the liver and stored in the gallbladder; breaks up large fat globules; composed of bile pigments, cholesterol, and bile salts
Pigment released by the liver in bile
Intestine
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VOCABULARY
canine teeth
cecum
colon
common bile duct
Pointed, dog-like teeth next to the incisors; also called cuspids or eyeteeth
First part of the large intestine
Consists of the ascending, transverse, descending, and sigmoid segments
Carries bile from the liver and gallbladder to the duodenum; also called the choledochus
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VOCABULARY
defecation
deglutition
dentin
digestion
Elimination of feces from the digestive tract through the anus
Swallowing
Primary material found in teeth; covered by the enamel in the crown and a protective layer of cementum in the root
Breakdown of complex foods to simpler forms
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VOCABULARY
duodenum
elimination
emulsification
enamel
First part of the small intestine; measures 12 inches long
Act of removal of materials from the body
Physical process of breaking up large fat globules into smaller globules
Hard, outermost layer of a tooth
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VOCABULARY
enzyme
esophagus
fatty acids
feces
Chemical that speeds up reactions between substances; enzyme names end in –ase
Tube connecting the throat to the stomach
Substances produced when fats are digested; a category of lipids
Solid wastes; stool
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VOCABULARY
gallbladder
glucose
glycogen
hydrochloric acid
Small sac under the liver; stores bile
Simple sugar
Starch; glucose is stored in the form of glycogen in liver cells
Substance produced by the stomach; necessary for digestion of food
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VOCABULARY
ileum
incisor
insulin
jejunum
Third part of the small intestine
One of four front teeth in the dental arch
Hormone produced by endocrine cells of the pancreas; transports sugar from the blood into cells and stimulates glycogen formation by the liver
Second part of the small intestine
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VOCABULARY
• lipase
• liver
• lower esophageal sphincter (LES)
Pancreatic enzyme needed to digest fats
Large organ located in the RUQ of the abdomen; secretes bile; stores sugar, iron, and vitamins; produces blood proteins; destroys worn-out RBCs; filters out toxins; normal adult liver weighs about 2 ½ to 3 pounds
Ring of muscles between the esophagus and stomach; cardiac sphincter
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VOCABULARY
mastication
molar teeth
palate
pancreas
Chewing
Sixth, seventh, and eighth teeth from the middle on either side of the dental arch
Roof of the mouth
Organ under the stomach; produces insulin and enzymes
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VOCABULARY
papillae (singular: papilla)
parotid gland
Peristalsis
pharynx
Small, nipple-like elevations on the tongue
Salivary gland within the cheek, just anterior to the ear
Rhythmic contractions of the tubular organs
Throat, the common passageway for food from the mouth and for air from the nose
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VOCABULARY
portal vein
Protease
pulp
pyloric sphincter
Large vein bringing blood to the liver from the intestines
Enzyme that digests protein
Soft tissue within a tooth, containing nerves and blood vessels
Ring of muscle at the end of the stomach, near the duodenum; opens when a wave of peristalsis passes over it
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VOCABULARY
pylorus
rectum
rugae
saliva
Distal region of the stomach, opening to the duodenum
Last section of the large intestine, connecting the end of the colon and the anus
Ridges on the hard palate and the wall of the stomach
Digestive juice produced by salivary glands; contains the enzyme amylase
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VOCABULARY
salivary glands
sigmoid colon
sphincter
stomach
Parotid, sublingual, and submandibular glands
Fourth and last, S-shaped segment of the colon, just before the rectum; empties into the rectum
Circular ring of muscle that constricts a passage or closes a natural opening
Muscular organ that receives food from the esophagus
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VOCABULARY
triglycerides
uvula
villi (singular: villus)
Fat molecules composed of three parts fatty acids and one part glycerol; subgroup of lipids
Soft tissue hanging from the middle of the soft palate
Microscopic projections in the wall of the small intestine that absorb nutrients into the bloodstream
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TERMINOLOGY – COMBINING FORMSPARTS OF THE BODY
• an/o
• append/o, appendic/o
• bucc/o
• cec/o
• celi/o
• cheil/o
• cholecyst/o
• choledoch/o
anus
appendix
cheek
cecum
belly,abdomen
lip
gallbladder
common bile duct
Combining Form Meaning
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TERMINOLOGY – COMBINING FORMSPARTS OF THE BODY (PT. 2)
• col/o colon
• colon/o colon
• dent/i tooth
• duoden/o duodenum
• enter/o intestines, usually small intestine
• esophag/o esophagus
• faci/o face
• gastr/o stomach
• gingiv/o gums
Combining Form Meaning
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TERMINOLOGY – COMBINING FORMSPARTS OF THE BODY (PT. 3)
• gloss/o tongue
• hepat/o liver
• ile/o ileum
• jejun/o jejunum
• labi/o lip
• lapar/o abdomen
• lingu/o tongue
• mandibul/o lower jaw, mandible
• odont/o tooth
Combining Form Meaning
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TERMINOLOGY – COMBINING FORMSPARTS OF THE BODY (PT. 4)
• or/o mouth
• palat/o palate
• pancreat/o pancreas
• peritone/o peritoneum
• pharyng/o throat
• proct/o anus and rectum
• pylor/o pyloric sphincter
• rect/o rectum
• sialaden/o salivary gland
Combining Form Meaning
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TERMINOLOGY – COMBINING FORMSPARTS OF THE BODY (PT. 5)
• sigmoid/o sigmoid colon
• stomat/o mouth
• uvul/o uvula
Combining Form Meaning
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TERMINOLOGY – COMBINING FORMSSUBSTANCES
• amyl/o starch
• bil/i gall, bile
• bilirubin/o bilirubin (bile pigment)
• chol/e gall or bile
• chlorhydr/o hydrochloric acid
• gluc/o sugar
• glyc/o sugar
Combining Form Meaning
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TERMINOLOGY – COMBINING FORMSSUBSTANCES (PT. 2)
• glycogen/o glycogen, animal starch
• lip/o fat
• lith/o stone
• prote/o protein
• py/o pus
• sial/o saliva, salivary
• steat/o fat
Combining Form Meaning
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TERMINOLOGY – SUFFIXES
-ase enzyme
-chezia defecation, elimination of wastes
-iasis abnormal condition
-prandial meal
Suffix Meaning
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QUICK QUIZ:
4. Which term means inflammation of the lip?
A. CholecystitisB. CeliacC. AppendicitisD. Cheilitis
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THREE TYPES OF ANASTOMOSOMES
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CH. 6: A
DDITIO
NAL SUFFIX
ES
DIGESTIV
E SYSTEM
TERMINOLOGY
BY
: RO
S AL
I ND
LA
ND
LE
S S , KA
TH
RY
N R
ES P I C
I O &
P RI S C
I LL
A R
I VA
S
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CHAPTER GOALS
• Define new suffixes and use them with digestive system combining forms.
• List and explain laboratory tests, clinical procedures, and abbreviations common to the digestive system.
• Apply your new knowledge to understanding medical terms in their proper context, such as medical reports and records.
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SUFFIXES
• -ectasis, -ectasia dilation, widening
• -emesis vomiting
• -pepsia digestion
• -phagia eating, swallowing
• -plasty surgical repair
• -ptysis spitting
Suffix Meaning
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SUFFIXES
• -rrhage, -rrhagia bursting forth (of blood)• -rrhaphy suture• -rrhea flow, discharge • -spasm involuntary contraction of
muscles • -stasis stopping; controlling• -stenosis narrowing, tightening• -tresia opening
Suffix Meaning
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QUICK QUIZ:
1. Which term means difficulty in swallowing?A. DysphasiaB. DysphagiaC. DysplasiaD. Polyphagia
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QUICK QUIZ:
2. Which term means to control or stop bleeding?A. HemostasisB. HematomaC. HemoptysisD. Cholestasis
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COMBINING FORMS AND TERMINOLOGY
• bucc/o cheek
• cec/o cecum
• celi/o abdomen
• cheil/o lip
• chol/e gall, bile
• cholangi/o bile duct (vessel)
• cholecyst/o gallbladder
• choledoch/ocommon bile duct
Combining Form Meaning
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COMBINING FORMS AND TERMINOLOGY
• col/o colon
• colon/o colon
• dent/i tooth
• duoden/o duodenum
• enter/o intestines
• esophag/o esophagus
• gastr/o stomach
• gingiv/o gums
Combining Form Meaning
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COMBINING FORMS AND TERMINOLOGY
• gloss/o tongue
• gluc/o sugar
• glyc/o sugar
• hepat/o liver
• herni/o hernia
• ile/o ileum
• jejun/o jejunum
• labi/o lip
Combining Form Meaning
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COMBINING FORMS AND TERMINOLOGY
• lingu/o tongue
• lip/o fat
• lith/o stone
• odont/o tooth
• or/o mouth
• palat/o palate
• pancreat/o pancreas
Combining Form Meaning
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COMBINING FORMS AND TERMINOLOGY
• proct/o anus and rectum
• pylor/o pyloric sphincter
• rect/o rectum
• sialaden/o salivary gland
• splen/o spleen
• steat/o fat
• stomat/o mouth
Combining Form Meaning
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QUICK QUIZ:
3. Which term means enlarged liver?A. AcromegalyB. CardiomegalyC. HepatomegalyD. Hepatitis
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LABORATORY TESTS
Liver function tests (LFTs): tests for enzymes and bilirubin in blood
Stool culture: test for microorganisms in stool
Stool guaiac test or Hemoccult test: test to detect blood in feces
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QUICK QUIZ:
4. Which of the following tests for the clear fluid that remains after blood has clotted (serum)?
A. Stool guaiacB. HemoccultC. Stool cultureD. LFTs
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LABORATORY TESTS: X-RAYS
• Lower gastrointestinal series (barium enema)
• Upper gastrointestinal series
• Cholangiography • Computed
tomography (CT scan)
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CLINICAL PROCEDURES Ultrasound examination
• Abdominal ultrasonography
• Endoscopic ultrasonography (EUS)
Magnetic resonance techniques
• Magnetic resonance imaging (MRI)
Nuclear medicine test
• Hepatobiliary iminodiacetic acid scan (HIDA scan)
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MISCELLANEOUS PROCEDURES
Gastric bypass or bariatric surgery: reduces stomach size
Gastrointestinal endoscopy: visual examination of the GI tract
Laparoscopy: visual examination of the abdomen Liver biopsy: removal of liver tissue for microscopic
examinationNasogastric intubation: insertion of a tube through
the nose into the stomachParacentesis (abdominocentesis): puncture to
remove fluid from abdomen
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QUICK QUIZ:
5. Which procedure is a surgical puncture to remove fluid from the abdomen?A. LaparoscopyB. LaparotomyC. AbdominectomyD. Abdominocentesis
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ABBREVIATIONS
• BRBPR
• EGD
• G tube
• GERD
• GI
• LAC
• NPO
Bright red blood per rectum
Esophagogastroduodenoscopy
Gastrostomy tube; PEG tube
Gastroesophageal reflux disease
Gastrointestinal
Laparoscopic-assisted colectomy
Nothing by mouth
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LA FINE