digestive system st120 concorde career college, portland
TRANSCRIPT
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Digestive System
ST120Concorde Career College, Portland
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Digestive SystemObjectives:
Define the term digestion. Describe the functions of the digestive
system.
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Digestive SystemObjectives:
List and identify the structures of the digestive system and describe the function of each.
List and identify the accessory structures of the digestive system and describe the function of each.
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Digestive SystemObjectives:
Describe the importance of adequate nutrition.
Describe the mechanism by which the digestive system helps to maintain homeostasis.
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Digestive SystemObjectives:
Describe common diseases, disorders, and conditions of the digestive system including signs and symptoms, diagnosis, and available treatment options.
Demonstrate knowledge of medical terminology related to the digestive system verbally and in the written form.
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Digestive SystemDigestion
Mechanical, chemical, and enzymatic process by which ingested food is converted into
material suitable for use at the cellular level.
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Digestive SystemFunctions of the Digestive System
Digestion
Absorption
Note: The digestive tract is also referred to as the alimentary tract or canal.
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Wall of the Digestive Tract
From outermost to innermost Serosa (visceral
peritoneum) Muscularis (2
layers) Submucosa Mucosa
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Peritoneum
Parietal - lines the abdominal cavity
Visceral - covers the organs
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Mesentery
Fanlike peritoneal fold that is attached posteriorly and attaches to the small intestine
Contains blood vessels, nerves, and lymphatic structures
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Mesocolon
Fanlike peritoneal fold that is attached posteriorly and attaches to the large intestine
Contains blood vessels, nerves, and lymphatic structures
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Diseased Mesocolon
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Greater Omentum
Flap-like peritoneal structure containing fat that extends from the greater curvature of the stomach to the pelvis
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Torsion of the Greater Omentum
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Lesser Omentum
Extends between the lesser curvature of the stomach and the liver
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Digestive Organs
Organs of the digestive tract (pathway)
Accessory organs
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Main Structures of the Digestive Tract
Mouth Pharynx Esophagus Stomach Small
Intestine Large
Intestine
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Oral Cavity
Functions: Ingestion Prepare ingested items for digestion Begin digestion of starch
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Oral Cavity
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Teeth
Deciduous Permanent Structure
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Mastication & Deglutition
Mastication Salivary glands Muscles
Deglutition Muscles
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Salivary Duct Stone
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Pharynx and Esophagus
Convey ingested items to the stomach
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Deglutition
Note movement of food bolus
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Impacted Esophageal Food Bolus
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Stomach
Divisions Curvatures Sphincters Muscles Rugae Gastric
Juices Chyme
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Rugae
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Gastrectomy Specimen
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Stomach Interior
Goblet Cells - Produce mucus
Parietal Cells - Produce hydrochloric acid
Chief Cells - Produce pepsin
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Small Intestine
Duodenum Jejunum Ileum
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Villi
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Large Intestine
Cecum Ileocecal valve Vermiform appendix
Ascending colon Transverse colon Descending colon Sigmoid colon Rectum Anus
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Colectomy Specimen
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Colectomy Specimen (Opened)
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Rectum and Anus
Rectum Valves of Houston
Anus Anal columns Anal sinuses Anal valves Internal sphincter External sphincter
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Accessory Structures
Liver Gallbladde
r Pancreas
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Liver
Largest glandular organ in the body
RUQ Two main lobes
(right and left) Two small inferior
lobes on the right
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Gallbladder
Located on the inferior surface of the liver
Stores bile
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Biliary Tree
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Biliary Tree
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Pancreas
Endocrine gland Exocrine gland Extends from
the duodenum (head) to the spleen (tail)
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Digestion
Breakdown of foods into usable substances
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Esophagogastroduodenoscopy: visualization of the esophagus, stomach, and duodenum
Colonoscopy: visualization of the inner surface of the entire colon from the rectum to the cecum.
Sigmoidoscopy: visualization of the sigmoid colon
Capsule endoscopy: a tiny video camera in a capsule that the pt. swallows. For 8 hrs it passes through the small intestine and transmits images of the walls of the small intestine.
Endoscopic Procedures
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Colonoscopy
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Diverticulosis: the condition of having diverticula small pouch or sac occurring in the lining or wall of
a tubular organ such as the esophagus or colon Enteritis: inflammation of the small intestine
caused by eating or drinking substances contaminated with viral and bacterial pathogens Gastroenteritis
Irritable bowel syndrome: (IBS) unknown cause with symptoms that include cramping, abdominal pain, bloating, constipation, and/or diarrhea.
Intestinal Disorders
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Diverticular Disease
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Gastrectmy Cholecystectomy Whipple pancreatectomy Diverticulectomy Ileectomy Jejunectomy Duodenectomy Colectomy Sigmoidectomy Proctectomy
Some Procedures