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Chapter 3 NUTR
1.
Chapter 3 Digestion, Absorption,
and Transport © 2009 Cengage - Wadsworth
2.
Digestion • Digestion is
the process of breaking down foods into nutrients to prepare for absorption while overcoming 7 challenges. © 2009 Cengage - Wadsworth
3.
Digestion • Anatomy of
the Digestive Tract – The gastrointestinal (GI) tract is the flexible muscular tube from mouth to anus. The lumen is the inner space of the tract. The mouth is the beginning of the digestive system. Digestion in the mouth involves mastication (chewing), the stimulation of taste buds, and swallowing. The epiglottis closes to prevent food from entering the pharynx. After swallowing the food is called a bolus. The esophagus is the tube that leads the bolus to the stomach. There is a sphincter at the upper and lower (also known as the cardiac sphincter) ends of the esophagus. © 2009 Cengage - Wadsworth
4.
Digestion • Anatomy of
the Digestive Tract The stomach adds juices and grinds the bolus to a semiliquid mass called chyme. The pyloric sphincter regulates the flow of partially digested food into the small intestine. The small intestine receives digestive juices from the gallbladder and the pancreas. The three segments of the small intestine are the duodenum, the jejunum and the ileum. The large intestine (colon) begins at the ileocecal valve and ends at the rectum and anus. The chyme passes by the opening of the appendix. © 2009 Cengage - Wadsworth
5.
© 2009 Cengage
- Wadsworth
6.
Digestion • The Muscular
Action of Digestion – under autonomic control Peristalsis pushes the digestive contents along. Stomach action involves circular, longitudinal, and diagonal muscles. Segmentation is contractions by circular muscles that contract and squeeze contents to promote mixing with digestive juices. Sphincter contractions open and close passageways. This prevents reflux and controls the passage of contents. © 2009 Cengage - Wadsworth
7.
© 2009 Cengage
- Wadsworth
8.
© 2009 Cengage
- Wadsworth
9.
© 2009 Cengage
- Wadsworth
10.
Digestion • The Secretions
of Digestion Includes digestive enzymes that act as catalysts in hydrolysis reactions Saliva from the salivary glands moistens foods Gastric juice from the gastric glands includes hydrochloric acid. The goblet cells of the stomach wall secrete mucus to protect the walls of the stomach from the high acidity levels that are measured by pH units. Pancreatic juice contains intestinal enzymes (carbohydrase, lipase, protease) and bicarbonate. Bile is produced by the liver, stored in the gall bladder, and acts as an emulsifier to suspend fat. © 2009 Cengage - Wadsworth
11.
© 2009 Cengage
- Wadsworth
12.
© 2009 Cengage
- Wadsworth
13.
Digestion • The Final
Stage Energy-yielding nutrients are disassembled for absorption. Vitamins, minerals and water can be absorbed. Undigested residues, including some fibers, continue through the digestive tract and form stool. Recycling of usable materials © 2009 Cengage - Wadsworth
14.
© 2009 Cengage
- Wadsworth
15.
© 2009 Cengage
- Wadsworth
16.
Absorption • The enormous
surface area of the small intestine facilitates nutrient absorption. • Nutrients can be absorbed through simple diffusion, facilitated diffusion, or active transport. © 2009 Cengage - Wadsworth
17.
© 2009 Cengage
- Wadsworth
18.
Absorption • Anatomy of
the Absorptive System Villi are the fingerlike projections within the folds of the small intestine that move in a wave-like pattern to trap nutrients. Microvilli are the microscopic hairlike projections on each villi. Crypts are the tubular glands that lie between the intestinal villi. Goblet cells are located between the villi and secrete a protective thick mucus. © 2009 Cengage - Wadsworth
19.
© 2009 Cengage
- Wadsworth
20.
Absorption • A Closer
Look at the Intestinal Cells Specialization of the cells to absorb different nutrients “Food combining” which emphasizes separating food for digestive purposes is a myth. Preparing Nutrients for Transport • Water-soluble nutrients and small products of fat digestion are released to the bloodstream. • Fat-soluble vitamins and larger fats form chylomicrons and are released to the lymphatic system. © 2009 Cengage - Wadsworth
21.
The Circulatory System •
Water-soluble nutrients and small fats are routed to the liver before being transported to the cells. • Fat-soluble nutrients, entering from the lymph, bypass the liver at first and eventually enter the vascular system. © 2009 Cengage - Wadsworth
22.
The Circulatory System •
The vascular system consists of arteries, capillaries and veins. The hepatic portal vein directs blood from the GI tract to the liver. The hepatic vein takes blood from the liver to the heart. The liver protects against toxic substances. © 2009 Cengage - Wadsworth
23.
© 2009 Cengage
- Wadsworth
24.
© 2009 Cengage
- Wadsworth
25.
The Circulatory System •
The lymphatic system consists of one-way vessels to transport fluid. Lymph is a clear, yellowish fluid without red blood cells or platelets that moves through the body by muscle contractions. The thoracic duct is the lymph’s route to the heart. The subclavian vein provides a return of lymph to the vascular system. Lacteals are the lymphatic vessels of the intestine that absorb nutrients and pass them to the lymphatic system. © 2009 Cengage - Wadsworth
26.
The Health and
Regulation of the GI Tract • The principle of homeostasis is important in the functioning of the digestive and absorptive systems. • The body’s hormonal and nervous control systems keep conditions normal. © 2009 Cengage - Wadsworth
27.
The Health and
Regulation of the GI Tract • Gastrointestinal Bacteria A healthy GI tract has many different non-disease-causing bacteria known as flora or microflora. Probiotics are bacteria found in the GI tract that can be beneficial to health. An example is the bacteria found in yogurt. Prebiotics are foods that are used as food by intestinal bacteria. © 2009 Cengage - Wadsworth
28.
The Health and
Regulation of the GI Tract • Gastrointestinal Hormones and Nerve Pathways Hormones act as messengers, and those involved in the GI tract are known as enterogastrones. Gastrin is secreted by the stomach. Pyloric sphincter Secretin is secreted by the duodenum. © 2009 Cengage - Wadsworth
29.
The Health and
Regulation of the GI Tract • Gastrointestinal Hormones and Nerve Pathways Pancreatic secretions change based on the content of the diet. The pancreas is protected against enzymes by creating enzyme precursors called proenzymes or zymogen. Cholecystokinin targets the gall bladder. Motility slows for foods that take longer to be digested. © 2009 Cengage - Wadsworth
30.
The Health and
Regulation of the GI Tract • The System at Its Best A healthy digestive tract is essential. Balance, moderation, variety and adequacy of meals are important. © 2009 Cengage - Wadsworth
31.
Common Digestive
Problems © 2009 Cengage - Wadsworth
32.
Choking • Food becomes
lodged in the trachea. • The larnyx cannot make sounds. • The Heimlich maneuver may need to be used. • Strategies Small bites Chew thoroughly. Don’t talk or laugh with food in the mouth. Don’t eat when breathing hard. © 2009 Cengage - Wadsworth
33.
© 2009 Cengage
- Wadsworth
34.
© 2009 Cengage
- Wadsworth
35.
Vomiting • Body’s adaptive
mechanism • Dehydration is a concern. • May be self-induced as in eating disorders © 2009 Cengage - Wadsworth
36.
Diarrhea • Frequent, loose,
watery stools • Irritable bowel syndrome or colitis is one of the common GI disorders. • Strategies Rest Drink fluids Medical help is needed if it persists. © 2009 Cengage - Wadsworth
37.
Constipation • Defecation habits
are different among people. • Many causes are possible. • Hemorrhoids may be a problem. • Diverticulosis is a condition in which the intestinal walls weaken and bulge. The bulging pockets are called diverticula. Diverticulitis is a worsened condition and requires intervention. • Use of laxatives, enemas and mineral oil may not be necessary with lifestyle changes. © 2009 Cengage - Wadsworth
38.
© 2009 Cengage
- Wadsworth
39.
Constipation • Colonic irrigation
is the internal washing of the large intestine and can be hazardous. • Strategies High-fiber diet Increased fluids Exercise regularly. Respond quickly to the urge to defecate. © 2009 Cengage - Wadsworth
40.
Belching and Gas •
Strategies Eat slowly. Chew thoroughly. Relax while eating. Watch bothersome foods. • Hiccups are triggered by eating or drinking too fast. © 2009 Cengage - Wadsworth
41.
Heartburn and
“Acid Indigestion” • Gastroesophageal reflux is the backward flow of stomach contents into the esophagus. • Antacids and acid controllers may help indigestion. © 2009 Cengage - Wadsworth
42.
© 2009 Cengage
- Wadsworth
43.
Heartburn and
“Acid Indigestion” • Strategies Small meals Liquids between meals Sit up while eating. Wait 1 hour after eating before lying down. Wait 2 hours after eating before exercising. Refrain from tight-fitting clothing. Avoid bothersome foods. Refrain from tobacco use. Lose weight if overweight. © 2009 Cengage - Wadsworth
44.
Ulcers • Peptic ulcers
can be gastric or duodenal. • Strategies Take prescribed medicine. Avoid caffeine- and alcohol-containing foods. Minimize aspirin and ibuprofen use. No smoking. © 2009 Cengage - Wadsworth
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