Chapter 3 Flashcards
Mucosa
Mucous membrane that produces thin mucus. It lines the oral cavity and the entire gastrointestinal system.
Tongue
Large muscle that fills the oral cavity and assists with eating and talking, as it mixes food particles with saliva.
Palate
Roof of Mouth. Hard palate (bone) and soft palate (posterior soft tissue) form the roof of the oral cavity. The soft palate ends in the fleshy hanging uvula. The soft palate senses food particles in the posterior oral cavity just before they are swallowed.
Pharynx
Throat. A passageway for food particles and air. It is between the oral cavity and the esophagus. INCLUDES: Nasopharynx (posterior to nasal cavity) Oropharynx (posterior to oral cavity Laryngopharynx (posterior to larynx)
Oral Cavity
The gastrointestinal system begins in the mouth or oral cavity
Lined with mucosa
Contains the teeth, gums, tongue, hard palate, and soft palate.
Alimentary Canal
Another name for the gastrointestinal system
Digestive system
Another name for the gastrointestinal system.
AKA digestive tract.
Gastrointestinal (GI) system
The structures of the gastrointestinal system include the oral cavity (teeth, gums, tongue, hard palate, soft palate), salivary glands (parotid, sublingual, submandibular), pharynx, esophagus, stomach, small and large intestines, rectum, anus, and the accessory organs.
Larynx
Structure below the pharynx. It is closed during swallowing when muscles in the neck pull it up to the epiglottis, a lid-like structure, so that swallowed food particles go into the esophagus and stomach.
Cardia
First part of the stomach where the stomach joins the esophagus.
Chyme
Semisolid mixture of food particles, saliva, and digestive enzymes in the stomach and small intestine.
Esophagus
Flexible tube approximately 10 inches in length that connects the pharynx to the stomach. It contains the lower esophageal sphincter.
Fundus
Rounded, top part of the stomach
Lower esophageal sphincter
Muscular ring at the distal end of the stomach. It closes to keep chyme in the stomach or opens to let chyme flow into the duodenum.
Pyloric Sphincter
Muscular ring at the distal end of the stomach. It closes to keep chyme in the stomach or opens to let chyme flow into duodenum.
Pylorus
Narrowed, last part of the stomach where it joins the duodenum. It contains the pyloric sphincter.
Rugae
Thick, deep folds in the gastric mucosa that expand to accommodate a large amount of swallowed food particles.
Stomach
Large, elongated sac in the upper abdominal cavity. It is between the esophagus and the small intestine.
Anus
External opening of the rectum. The anal sphincter is under voluntary control.
Appendix
Long, thin pouch on the exterior wall of the cecum. It contains lymphoid tissue and is part of the immune response; it does not play a role in digestion.
Cecum
Short sac that is the first part of the large intestine.
The appendix is attached to the cecum’s external wall.
Colon
Second and longest part of the large intestine. It includes the ascending colon, transverse colon, descending colon and sigmoid colon.
Ascending colon -> Transverse colon -> descending colon -> sigmoid colon
Duodenum
The 10-inch, C-Shaped, first part of the small intestine. It is between the stomach and the jejunum.
Ileum
Third and final part of the small intestine. It is 12 feet long and is located between the jejunum and the cecum of the large intestine.
Jejunum
Second part of the small intestine. It is an 8-foot coiled segment between the duodenum and the ileum.
Haustra
Puckered pouches in the intestinal wall that expand to receive large amounts of waste materials.
Large intestine
Large, tubular structure in the abdominopelvic cavity. It is about 5 feet in length and is located between the small intestine and the anus. The large intestine includes the cecum, colon, rectum, and anus.
AKA Large Bowel
Lumen
Central, open area inside a tubular structure such as the esophagus, small intestine, and large intestine.
Rectum
Short, straight segment that is the last part of the large intestine. Between the sigmoid colon and the outside of the body.
Small intestine
Long, tubular structure in the abdominopelvic cavity. Between stomach and large intestine.
Villi
Thousands of microscopic, thin structures in the mucosa that project into the lumen of the small intestine.
Abdominopelvic Cavity
Continuous cavity within the abdomen and pelvis. It contains the largest organs of the gastrointestinal system. Lined with the peritoneum.
Bile
Thick, yellow-green digestive enzyme produced by the liver; it flows through the bile ducts and is stored in the gallbladder.
Bile contains the yellow pigment bilirubin, and the green pigment biliverdin.
Bil/i-, Bill/o-, Chol/e-
Bile ducts
Bile from the liver flows through the common hepatic duct into the common bile duct.
Gallbladder
An accessory organ of the gastrointestinal system.
Teardrop-shaped, dark green sac posterior to the liver.
Liver
An accessory organ of the gastrointestinal system. The liver is a large, dark red-brown organ in the RUQ of abdominal cavity. It contains hepatocytes that produce bile.
Mesentery
Thick, fan-shaped sheet of peritoneum that supports loops of the jejunum and ileum.
Omentum
Broad, fatty covering of peritoneum that supports the stomach and protects the small intestine.
Pancreas
Accessory organ of the gastrointestinal system. The pancreas is a yellow, elongated, triangular organ posterior to the stomach.
Secretes amylase, lipase, and protein-digesting enzymes through the pancreatic duct into the duodenum. The pancreas is also a gland of the endocrine system.
Peritoneum
Double-layered serous membrane that lines the abdominopelvic cavity and surrounds the gastrointestinal organs.
It secretes peritoneal fluid, a watery fluid that fills the spaces between the gastrointestinal organs,
Absorption
Process by which water and fluids in the oral cavity move into the blood that is in blood vessels under the tongue.
Also, in the stomach, water and some liquid/dissolved drugs are absorbed.
Amylase
Digestive enzyme in saliva that begins the digestion of carbohydrates in the oral cavity.
Amylase is also secreted by the pancreas, and it further breaks down complex sugar molecules into glucose.
Bile
Digestive enzyme released by the gallbladder. Bile breaks down fats in the chyme into small fat globules
Chemical Digestion
Digestive process that involves digestive enzymes, acids, and other substances to chemically break down food. It includes emulsification.
Cholecystokinin
Hormone produced by the duodenum when it receives fatty chyme from the stomach. Cholecystokinin stimulates the gallbladder to release bile, and it also stimulates the pancreas to secrete its digestive enzymes into the duodenum.
Chyme
Semisolid mixture of food particles, saliva, and digestive enzymes in the stomach and small intestine.
Defecation
Process by which undigested food fibers, waste materials, and water are eliminated from the body as a bowel movement or feces or stool.
The passage of flatus (Gus) my also occur.
Deglutition
Process Of swallowing for particles and moving them into the pharynx.
This is part of mechanical digestion.
Digestion
Process of breaking down food into nutrients that can be used by the body.
Digestion begins in the oral cavity and continues throughout the small intestine.
Elimination
Process in which food fibers, waste materials, and water are eliminated from the body in a solid form. Also known as defecation.
Emulsification
Process in which bile breaks down fats in the chyme into small fat globules. This is part of chemical digestion.
Enzymes
Substances that speed up chemical reactions. Enzymes are produces by the salivary glands, stomach, small intestine, and pancreas. An enzyme name usually ends in -ase.
Gastric
Hormone produced by the stomach. It stimulates the release of hydrochloric acid and pepsinogen.
Glucose
Simple sugar that is the only source of energy that body cells can use
Hydrochloric acid
Strong acid produced by the stomach. It breaks down food fibers and converts pepsinogen to pepsin.
Intrinsic factor
Substance produced by the stomach. It helps the stomach absorb vitamin B12 from foods.
Lactase
Digestive enzyme produced by the small intestine.
It breaks down complex sugar molecules and the sugar in milk to the simple sugar glucose.
Lipase
Digestive enzyme secreted by the pancreas.
It breaks down small fat globules into fatty acids.
Mastication
The teeth tear, chew, and grind food in the oral cavity. The tongue moves food particles and mixes them with saliva.
This is part of mechanical digestion.
Mechanical digestion
Digestive process that involves some type of physical force and movement.
It includes mastication, deglutition, and peristalsis.
Pepsin
Digestive enzyme in the stomach that breaks down protein foods.
Pepsinogen
Inactive substance produced by the stomach.
It is converted by hydrochloric acid to the digestive enzyme pepsin.
Peristalsis
Coordinated waves of smooth muscle contractions of the esophagus, stomach, and intestines.
Peristalsis moves food particles,chyme, waste materials, and water through the gastrointestinal system.
Peristalsis is part of mechanical digestion.
Anorexia
Decreased appetite because of disease or the gastrointestinal side effect of a drug.
The patient is aid to be anorexic.
Dysphagia
Painful eating or difficulty swallowing. Painful eating can be caused by an infection in the mouth, poorly fitting dentures, or radiation therapy to the mouth for cancer.
Polyphagia
Excessive overeating due to an overactive thyroid gland, diabetes mellitus, or a psychiatric illness.
Treatment: Correct the underlying cause.
Glossitis
Infection or inflammation of the tongue. This can be caused by a bacterial or viral infection, food allergies, abrasive or spicy foods, or a vitamin B deficiency.
Sialolithiasis
A stone (sialolith) forms in the salivary gland and becomes lodged in the duct, blocking the flow of saliva.