the digestive system chapter 15 - somerset canyons€¦ · what are tonsil stones? tonsilloliths,...
TRANSCRIPT
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The Digestive System Chapter 15
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15.1
Functions: mechanical and chemical breakdown of food
absorption of nutrients
Consists of alimentary canal and accessory organs
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15.2 Characteristics of the Canal1. Mucosa - protects tissues and carries absorption2. Submucosa - glands, blood vessels, nerves3. Muscular Layer - smooth muscle tissue, pushes food (PERISTALSIS)
4. Serosa - visceral peritoneum, lubricates surfaces (serous fluid)
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Villi increase surface area for absorption of nutrients.
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DRAW THIS!
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Mixing Movements
Contractions mix food with digestive juices Propelling Movements
Peristalsis - pushes food down the tube
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15.3 Anatomy of the Mouth
Mouth - begins digestion by chewing and mixing with saliva
Tongue - moves food, connects to floor of mouth via FRENULUM; has papillae
Palate - forms roof of oral cavity (hard and soft); Uvula - back of the mouth
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Palatine Tonsils - part of the immune system
Tonsillitis is an inflammation of the tonsils and will often, but not necessarily, cause a sore throat and fever. In chronic cases tonsillectomy may be indicated.
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What are tonsil stones? Tonsilloliths, are hard white formations that are located on or within the tonsils.
What causes them?
Grooves and ridges on the tonsils can harbor bacteria and other debris. That debris eventually hardens, forming a stone.
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Teeth Primary (baby) vs Secondary teeth
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Teeth
1st, 2nd, 3rd Molars
BICUSPIDSCUSPIDS
INCISORS
CANINES
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Anatomy of a Tooth
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Tooth Decay
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Salivary Glands produce AMYLASE
this enzyme breaks down starch into sugars
Mucus cells also produce mucus for lubrication during swallowing 1.Parotid Gland
2. Submandibular Gland3. Sublingual Gland
Salivary Glands
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1. Parotid - ear, cheek2. Submandibular - below jaw3. Sublingual - under tongue
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Pharynx
nasopharynxoropharynxlaryngopharynx
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Esophagusesophageal hiatus is where it penetrates the diaphragm cardiac sphincter at entrance to stomach
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STOMACH MUSCLES: Longitudinal, Circular, Oblique
FUNDUSESOPHAGUS
Longitudinal muscles
Circular muscles
Oblique muscles
CARDIAC REGION
LESSER CURVATUREPYLORIC SPHINCTER
DUODENUM
GREATER CURVATURE
BODY of stomach
RUGAE
Cardiac sphincter
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Stomach
Regions
● Cardiac● Fundic● Body (greater and
lesser curvature)● Pyloric
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Stomach Lining
Glands secrete gastric juices to breakdown foodPEPSIN - most important digestive enzyme for breaking down food
Mucus prevents stomach from digesting itself, small openings called gastric pits contain glands
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Chyme - paste, after food has been broken down, released then into the duodenum via the pyloric sphincter valve
Rugae - folds within stomach
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PANCREAS - secretes insulin which breaks down sugars
Pancreatic Juice also breaks down fat
Chemicals empty into the
DUODENUM
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Liver 1 large right lobe | 1 smaller left lobe
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BILIARY SYSTEM Consists of liver, gall bladder, ducts Functions to create bile used in digestion
(5) Cystic Duct (gall bladder)
(4) Hepatic Duct (liver)
Join to form the (6)COMMON BILE DUCT
Empties into the duodenum
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Liver Functions1. blood glucose levels2. breakdown of lipids and fats3. protein metabolism4. stores vitamins5. recycles RBCs6. removes toxins7. secretes bile
Bile – yellowish-green liquid aids in digestion, breakdown of fat
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Remember Bili Lights?
Using bili lights is a therapeutic procedure performed on newborn or premature infants to reduce elevated levels of bilirubin. If blood levels of bilirubin become too high, the bilirubin begins to dissolve in the body tissues, producing the characteristic yellow eyes and skin of jaundice.
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1. Duodenum
2. Jejunum
3. Ileum
MESENTERY - supports coils of small intestine and contains blood vessels
15.9 Small IntestineMain function: absorption of nutrients
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Greater Omentum (peritoneum)
a "curtain-like" membrane that covers the intestines, stores fat and lays like a drape
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Greater Omentum
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Intestinal villi - increase surface area to absorb nutrients, connect to vessels
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Large Intestine1. Cecum = start of large
intestine, has an attached appendix
2. Colon = 4 sections, ascending / transverse / descending / sigmoid
3. Rectum – stores waste before it is expelled from the body4. Anus -muscular sphincter which controls the exit of waste
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Stomach
Jejunum
IleumCecum
Appendix
Ascending Colon
Transverse Colon
Descending Colon
Sigmoid ColonRectum
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Function of Large IntestineSecretes mucus, reabsorbs water, contains bacteria to aid in digestion (intestinal flora)
Mass Movements (defecation) - removes undigested food
The main job is WATER REABSORPTION..
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Types 1–2 indicate constipation, with 3 and 4 being the ideal stools (especially the latter), as they are easy to defecate while not containing any excess liquid, and 5, 6 and 7 tending towards diarrhea.
Source: wiki
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1. esophagus2. liver3. stomach4. pyloric sphincter5. duodenum6. pancreas7. jejunum8. ileum9. cecum10. appendix11. ascending colon12. descending colon13. sigmoid colon14. anus
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Disorders of the Digestive SystemA Gastroenterologist is a physician with dedicated training and unique experience in the management of diseases of the gastrointestinal tract and liver.
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GERDGastroesophageal reflux disease (acid reflux)
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Dysentery or DiarrheaFailure to reabsorb water in the large intestine, which leads to watery stool. Dehydration can lead to death.
Causes Include:
Parasitic Infection (Ameba, Cryptosporidium)Bacterial Infection (Cholera, E. coli, Salmonella)Viruses (Norovirus and other stomach bugs)Food allergy or intolerance
Gastroenteritis is a generic name used to describe vomiting and diarrhea
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Cholera cots
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The MICROBIOME
The average human digestive tract is home to as many as 1,000 species of microorganisms When something upsets the balance of these organisms in your gut, otherwise harmless bacteria can grow out of control and make you sick.
One of the worst offenders is a bacterium called Clostridium difficile(or C. diff).
Become a Stool Donor at OPENBIOME.org
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HEPATITIS A, B, CHepatitis A
-caused by eating food or water infected with a virus called HAV.
While it can cause swelling and inflammation in the liver, it doesn't lead to chronic disease. Almost everyone who gets hepatitis A has a full recovery, some may need hospitalization.
There is a vaccine!
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Hepatitis B is spread by contact with an infected person's blood, semen, or other body fluid. Some people never develop symptoms, others develop chronic symptoms that stay with them their whole life.
There is a vaccine!
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Hepatitis C is caused by the virus HCV. It is spread the same way as hepatitis B, through contact with an infected person's blood, semen, or body fluid.
Like hepatitis B, hepatitis C causes swelling of the liver and can cause liver damage that can lead to cancer. Most people who have hepatitis C develop a chronic infection. This may lead to a scarring of the liver, called cirrhosis.
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Crampy abdominal pain
Fatigue
Loss of appetite
Pain with passing stool (tenesmus); bloody stool
Persistent, watery diarrhea
Weight loss
Constipation
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IBS - Irritable Bowel SyndromeThe muscles in the bowel wall may contract too forcefully or too weakly, too slowly or rapidly at certain times.
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STOMACH ULCERSBurning upper abdominal pain, particularly between meals, early in the morning, or after drinking orange juice, coffee, or alcohol,
Treated with antibiotics to kill H. pylori bacteria.
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Constipationdifficulty in emptying the bowels, usually associated with hardened feces.
symptoms of chronic constipation include:
Passing fewer than three stools a week
Having lumpy or hard stools
Straining to have bowel movements
Feeling as though you can't completely
empty the stool from your rectum
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Hemorrhoids
swollen veins in your anus and lower rectum
may result from straining during bowel movements or from the increased pressure on these veins during pregnancy
Can cause pain, itching, and minor bleeding during bowel movements
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Lactose Intolerance Inability to digest milk, can cause stomach upset
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Appendicitis Recent news on the function of the appendix.
The appendix acts as a storehouse for good bacteria, “rebooting” the digestive system after diarrheal illnesses.
ScienceDaily Article
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Herniaintestines poke through abdominal muscles
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When people with celiac disease eat foods containing gluten, their immune system responds by damaging villi
Without healthy villi, a person becomes malnourished, no matter how much food one eats.
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Gallstones (Cholelithiasis)
Gallstones are made from cholesterol and other things found in the bile. They can be smaller than a grain of sand or as large as a golf ball.
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Gallstones within the gall bladder
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Obesity = BMI is 30 or moreBody Mass Index is based on height and weight
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Treatments (extreme) for obesity
Gastric BypassLap Band
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Dysphagia - problems with swallowing
Aspiration - when food or other objects enter the airway.
Can result in aspiration pneumonia
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Colon CancerColonoscopy is a screening technique to detect cancer.
See Katie Couric's Colonoscopy
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LABEL THIS!
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