Chapter 15 The Digestive System. Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 2 DIGESTIVE SYSTEM.

Slides:



Advertisements
Similar presentations
The Digestive System.
Advertisements

NOTES: The Digestive System (UNIT 8, part 1)
Slide 1 Mosby items and derived items © 2012 by Mosby, Inc., an affiliate of Elsevier Inc. Chapter 15 The Digestive System.
Chapter 25,26,27 Digestion and Nutrition General Characteristics of the Alimentary Canal Approximately 27 feet Structure of the wall –
Digestive System Structures 2.07
Ch 8 Digestive System Structures.
The Digestive System Explain the structure of the digestive system
Digestive System.
2.07 Remember the structures of the digestive system
Chapter 17: The Digestive System
Major structures involved. STRUCTURES  MAIN ORGANS  Mouth  Pharynx  Esophagus  Stomach  Small Intestine  DUODENUM  JEJUNUM  ILEUM  Large Intestine/Colon.
Digestive System. LNng LNng.
THE DIGESTIVE SYSTEM EDILBERTO A. RAYNES, MD.
Chapter 16 – digestive system
The Digestive System Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings.
Gastrointestinal System
Figure 14.1  The human digestive system: Alimentary canal and accessory organs. (Spleen)
Digestive System.
DIGESTIVE SYSTEM.
CHAPTER 15 DIGESTIVE SYSTEM
The Digestive System. WALL OF THE DIGESTIVE TRACT A. Mucosa - mucous epithelium B. Submucosa - connective tissue C. Muscularis - 2 or 3 layers of smooth.
DIGESTIVE SYSTEM Chapter 3. Digestion is the mechanical and chemical breaking down of food into smaller components, to a form that can be absorbed, for.
Digestive System Vocabulary ©Richard L. Goldman March 31, 2003 from: Delmar’s Comprehensive Medical Terminology.
Slide 1 Mosby items and derived items © 2012 by Mosby, Inc., an affiliate of Elsevier Inc. Chapter 15 The Digestive System.
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings The Digestive System  Digestion  _________________ of ingested food  _______________.
Digestion. Functions: Ingest: take food in through mouth Mechanical processing: manipulate (chew/swallow) from mouth, mixing in stomach Digestion: chemical.
By: Jama Willbanks, MS, NREMT-P The Digestive System.
Chapter 19-Digestive System. Chapter : Digestive System Overview.
The DIGESTIVE System.
Chapter 15 The Digestive System. Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 2 DIGESTIVE SYSTEM.
Welcome to Unit 5 Chapters 15 & 16. Chapter 15 The Digestive System.
© 2010 Delmar, Cengage Learning 1 PowerPoint Presentation to Accompany.
Most animals ingest chunks of food
When Human Digestive System becomes A luxury tour is waiting for U Duodenum Dynamics Ad Agency© Disneyland…
Pharynx (throat) Salivary Oral cavity glands (mouth) Esophagus Stomach
The Digestive System Digestion The process of changing complex solid foods into simpler soluble forms which can be absorbed by body cells.
Digestive System Organs Involved. Mouth n Oral Cavity n Food enters – Ingested n Roof, Walls, Floor Mucous Membrane n Physical & Chemical Breakdown.
The Alimentary Canal A long muscular tube that begins at the mouth and includes the oral cavity, pharynx, esophagus, stomach, small intestines,
Digestive System (Gastrointestinal)
The Digestive System and Body Metabolism
Nutrition and the Digestive System
Chapter 17 The Digestive System. Alimentary canal aka GI tract Extends from mouth to anus –9 m (29 feet) Functions: –Digestion –Absorption –Metabolism.
Chapter 15 The Digestive System. Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 2 DIGESTIVE SYSTEM.
General anatomy of the Digestive System
Digestive System Functions of the Digestive system:
Copyright © The McGraw-Hill Companies, Inc.Chapter 6 Human Structure and Function The Digestive System The Gastrointestinal (Digestive) System Every cell.
Gastrointestinal System Anatomy Responsible for the physical and chemical breakdown of food so it can be used by the body cells and tissues. 2 Parts: 1.Alimentary.
Digestive Anatomy. Alimentary Canal organs thru which food actually passes oral cavity pharynx esophagus stomach small intestine large intestine.
Digestive System: Path of food
© 2016 by Elsevier Inc. All rights reserved.
The Digestive System.
Human Digestive System
The Digestive System.
The Gastrointestinal (Digestive) System
Chapter 15 The Digestive System Jeanelle F. Jimenez RN, BSN, CCRN
The Human Digestive System
May 14, 2018 Journal: What organs make up the digestive system?
The Digestive System Chapter 15.
The Digestive System and Body Metabolism
DIGESTIVE SYSTEM STRUCTURE.
Slide of 34.
The Digestive System Explain the structure of the digestive system
The Gastrointestinal (Digestive) System
2.07 Remember the structures of the digestive system
The DIGESTIVE System.
Slide of 34.
Slide 1-18 of 34.
Starter - Review “Curvature of the Spine”
The Digestive System and Body Metabolism
Digestive System Organs
Presentation transcript:

Chapter 15 The Digestive System

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 2 DIGESTIVE SYSTEM (FIGURE 15-1)  Irregular tube called alimentary canal or gastrointestinal (GI) tract  Food must first be digested, then absorbed, and later metabolized

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 3

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 4 WALL OF THE DIGESTIVE TRACT (FIGURE 15-2)  Digestive tract described as tube that extends from mouth to anus  Wall of the digestive tube is formed by four layers of tissue:  Mucosa—mucous epithelium  Submucosa—connective tissue  Muscularis—two layers of smooth muscle  Serosa—serous membrane that covers the outside of abdominal organs; it attaches the digestive tract to the wall of the abdominopelvic cavity by forming folds called mesenteries

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 5

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 6 MOUTH  Roof—formed by hard palate (parts of maxillary and palatine bones) and soft palate, an arch-shaped muscle separating mouth from pharynx; uvula, a downward projection of soft palate (Figure 15-4)  Floor—formed by tongue and its muscles; papillae, small elevations on mucosa of tongue; taste buds, found in many papillae; lingual frenulum, fold of mucous membrane that helps anchor tongue to floor of mouth (Figure 15-4)  Typical tooth (Figure 15-5)  Three main parts—crown, neck, and root  Enamel, which covers the crown, is hardest tissue in body

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 7

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 8 MOUTH  Types of teeth—incisors, cuspids, bicuspids, and tricuspids  Twenty teeth in temporary set; average age for cutting first tooth about 6 months; set complete at about 2 years of age  Thirty-two teeth in permanent set; 6 years about average age for starting to cut first permanent tooth; set complete usually between ages of 17 and 24 years (Figure 15-6)

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 9 SALIVARY GLANDS (FIGURE 15-7)  Parotid glands—largest salivary glands  Submandibular glands—open into mouth on either side of frenulum  Sublingual glands—open into floor of mouth

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 10

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 11 PHARYNX  Subdivided into three anatomical components:  Nasopharynx  Oropharynx  Laryngopharynx

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 12 ESOPHAGUS  Connects pharynx to stomach  Dynamic passageway for food

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 13 STOMACH (Figure 15-8)  Size—expands after large meal; about size of large sausage when empty  Food enters stomach through gastroesophageal (cardiac) sphincter  Pyloric sphincter muscle closes opening between pylorus (lower part of stomach) and duodenum  Wall—many smooth muscle fibers; contractions produce churning movements (peristalsis)  Lining—mucous membrane; many microscopic glands that secrete gastric juice and hydrochloric acid into stomach; mucous membrane lies in folds (rugae) when stomach is empty

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 14

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 15 SMALL INTESTINE (FIGURE 15-9)  Size—about 7 meters (20 feet) long but only 2 cm or so in diameter  Divisions  Duodenum  Jejunum  Ileum

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 16

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 17 SMALL INTESTINE  Wall—contains smooth muscle fibers that contract to produce peristalsis  Lining—mucous membrane; many microscopic glands (intestinal glands) secrete intestinal juice; villi (microscopic finger-shaped projections from surface of mucosa into intestinal cavity) contain blood and lymph capillaries

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 18 LIVER AND GALLBLADDER  Size and location—liver is largest gland; fills upper right section of abdominal cavity and extends over into left side  Liver secretes bile  Ducts (Figure 15-10)  Hepatic—drains bile from liver  Cystic—duct by which bile enters and leaves gallbladder  Common bile—formed by union of hepatic and cystic ducts; drains bile from hepatic or cystic ducts into duodenum  Gallbladder  Location—undersurface of the liver  Function—concentrates and stores bile produced in the liver

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 19 PANCREAS  Exocrine gland that lies behind stomach  Functions  Pancreatic cells secrete pancreatic juice (most important digestive juice) into pancreatic ducts; main duct empties into duodenum  Pancreatic islets (of Langerhans)—cells not connected with pancreatic ducts; secrete hormones glucagon and insulin into the blood

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 20 LARGE INTESTINE (FIGURE 15-12)  Divisions  Cecum  Colon—ascending, transverse, descending, and sigmoid  Rectum  Food enters through ileocecal valve; external opening called anus  Wall—contains smooth muscle fibers that contract to produce churning, peristalsis, and defecation  Lining—mucous membrane

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 21

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 22 APPENDIX  Blind tube off cecum  No important digestive functions in humans

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 23 PERITONEUM (FIGURE 15-14)  Definitions—peritoneum, serous membrane lining abdominal cavity and covering abdominal organs; parietal layer of peritoneum lines abdominal cavity; visceral layer of peritoneum covers abdominal organs; peritoneal space lies between parietal and visceral layers  Extensions—largest are the mesentery and greater omentum  Mesentery is extension of parietal peritoneum, which attaches most of small intestine to posterior abdominal wall  Greater omentum, or “lace apron,” hangs down from lower edge of stomach and transverse colon over intestines  X-ray studies of the GI tract—radiopaque contrast medium used to help visualize structures in study images

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 24 DIGESTION (TABLE 15-2)  Definition—transforms foods into substances that can be absorbed and used by cells  Mechanical digestion—chewing (mastication), swallowing (deglutition), and peristalsis break food into tiny particles, mix them well with digestive juices, and move them along the digestive tract  Chemical digestion—breaks up large food molecules into compounds that have smaller molecules; brought about by digestive enzymes (Figure 15-15)  Enzymes and chemical digestion  Enzymes are specialized protein molecules that act as catalysts  Breakdown process called hydrolysis

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 25

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 26 DIGESTION  Carbohydrate digestion—mainly in small intestine  Pancreatic amylase—breaks polysaccharides down to disaccharides  Intestinal juice enzymes Maltase—changes maltose to glucose Maltase—changes maltose to glucose Sucrase—changes sucrose to glucose Sucrase—changes sucrose to glucose Lactase—changes lactose to glucose Lactase—changes lactose to glucose

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 27 DIGESTION  Protein digestion—starts in stomach; completed in small intestine  Gastric juice enzyme pepsin partially digests proteins  Pancreatic enzyme, trypsin, continues digestion of proteins  Intestinal enzymes, peptidases, complete digestion of partially digested proteins and convert them to amino acids  Fat digestion  Bile contains no enzymes but emulsifies fats (breaks fat droplets into very small droplets)  Pancreatic lipase changes emulsified fats to fatty acids and glycerol in small intestine

Elsevier items and derived items © 2008, 2004 by Mosby, Inc., an affiliate of Elsevier Inc. Slide 28 ABSORPTION  Definition—process by which digested food moves from intestine into blood or lymph  Foods and most water minerals and vitamins are absorbed from small intestine; some water and vitamin K also absorbed from large intestine  Surface area absorption  Structural adaptations increase absorptive surface area  Fractal geometry—study of fragmented geometric irregular shapes such as those in lining of intestine