Definition Flashcards
Four Major functions of the digestive system
ingestion of food
digestion of food
absorption of nutrients
elimination of wastes
alimentary tract
The digestive system is known by many names, including the digestive tract, the alimentary tract, and the gastrointestinal or G.I. System.
Alimentary tract begins at the mouth and ends at the anus, is basically a lawn, muscular tube several accessory organs (salivary glands, liver,gallbladder, and pancreas
gastro/intestin/al
gastrointestinal
Refers to the stomach and the intestines
digestive tract
Is a long, muscular tube, lined with mucus membrane, that extends from the mouth to the anus
upper G.I. tract (UGI)
consist of the mouth (oral cavity), pharynx (throat), esophagus, and stomach
lower G.I. tract
Is made up of the small and large intestines
accessory organs (digestive glands)
Salivary glands, liver, gallbladder, and pancreas secrete fluids that aid in digestion of food and absorption of nutrients
The liver, gallbladder, and pancreas, are located near the other digestive structures within the abdominal cavity. The liver, gallbladder, pancreas, and salivary glands produce substances that are needed for proper digestion and absorption of nutrients, and are considered to be……………. organs of the digestive system.
These organs lie outside the digestive tract, if they produce her store secretions that are convey to the digestive tract by ducts. The secretions aid in the breakdown of food.
nutrition
Is the sum of the process involved in the taking in, digestion, absorption, and use of food substances by the body
digestive system
Provides the body with water, nutrients, and minerals and illuminates undigested food particles
Nutrition can be divided into four stages
The stages from beginning to end can be divided into four separate functions:
ingestion
digestion
absorption
elimination
Stage 1: Ingestion
Swallowing, orally, taking substances into the body
How to body takes in nutrients
Stage 2: digestion
Conversion of food into substances that can be absorbed; actually begins in the mouth
Stage 3: absorption
digested food molecules pass through the lining of the small intestine into the blood or lymph
Stage 4: elimination
Excretion of undigested food particles (wastes) through the anus
after swallowing
Food particles are moved along the digestive tract and mix with enzymes and digestive fluids. Movements are brought about by the contractions of smooth muscles of the digestive system.
peri/stalis
peristalis
around/contraction
The presence of food in the digestive tube stimulates a coordinated, rhythmic, muscular contraction called
Digestion consist of mechanical and chemical processes
mechanical digestion begins in the mouth with chewing and continues with churning actions in the stomach.
Carbohydrates, proteins, and fats are transformed into smaller molecules through chemical digestion.
The accessory organs contribute digestive fluids to aid this process.
absorption (third stage of digestion)
The process in which digested food molecules pass through the small intestine lining into the blood or lymph capillaries
Numerous folds in the small intestine increase the speed of transfer of nutrient molecules in the third stage of digestion.
excreted
Eliminated
assimilation
Is the process of incorporating nutritive material into living tissue and occurs either after or simultaneously with absorption
Feces
a.k.a. stool, or fecal material
Wastes are excreted (elimated) through the anus in the form of…..
Our body weighs that is discharge from the bowels, by the way of the anus where feces are discharged
anus
Is the opening of the large intestine to the outside.
Elimination of undigested food particles
is only one type of elimination of body wastes. Other body wastes include carbon dioxide, excreted by the lungs and excess water, and other substances excreted in the urine and through perspiration.
Alimentation
Is the process of providing nourishment, or nutrition, for the body
metabolism
good nutrition is essential for metabolism, the sum of all the physical and chemical processes that take place in living organisms and result in growth, generation of energy, illumination of wastes, and other body functions as they relate to the distraction of nutrients in the blood after digestion.
Providing substances
(carbohydrates and fats)
tissue-building compounds
(Proteins)
inorganic chemicals
(Water and mineral salts)
A balanced diet
is one that is adequate in energy-providing substances, tissu-building compounds, inorganic chemicals, vitamins, in certain other substances, such as bulk for promoting movement of the contents of the digestive tract
The dietary reference intakes (DRIs)
Are the levels of daily intake of essential nutrients that are considered adequate to meet nutritional needs
hemostasis, equilibrium of the internal environment of the body
Is maintained even though the amounts of various food, substances and water that we take in vary.
Three classes of nutrients and their functions
1) carbohydrates (includes starches and sugars), the basic source of cell energy
2) proteins ( nitrogenous compounds ), provide amino acids and building material for development, growth, and maintenance
3) fats (lipids), energy reserve
glycol/lysis
glycolysis
sugar/Destroying, breaking down
the breaking down of sugar
Gluclose
A simple sugar, is the major source of energy for the body‘s cells.
It is found in certain foods, especially fruits, and it is also formed when more complex sugars and starches are broken down by the digestive system.
The concentration of glucose in the blood in healthy individuals is maintained at a fairly constant level.
Starches
The second type of carbohydrate, breakdown easily, and are eventually reduced to glucose before being absorbed into the blood.
amylo/lysis
amylolysis
Destruction of starch
The digestive process whereby starch is converted into sugars
proteo/lysis
proteolysis
Breaking down (destruction, digestion) a protein
Proteolysis is necessary for digestion because proteins must be chemically broken down before they can be absorbed.
lipids (fats)
serve as energy reserve. When stored in fat cells, they form lipoid tissues, that helps to cushion and insulate vital organs. Although lipids also include steroids, waxes, and fatty acids, lip(o) usually refers to fats.
lip/oid
lipoid
Means resembling fats
Bile
Is a digestive chemical that breaks fat into smaller particles, preparing them for further action by lipases and absorption.
Aids in the digestion of fats
Calories
Are units that are used to denote the energy value of food or the heat expenditure of an organism. Proteins, carbohydrates, and fats contain calories. Having about twice as many calories per gram is carbohydrates and proteins, bats are well-suited for storage of unused calories.
Appetite
The normal desire for food
eu/pepsia
eupepsia
Normal digestion
Digestive enzymes
Act on food, substances, causing them to break down into simpler compounds
Enzymes
Are usually named by adding -ase to the combining form of the substance on which they act. For example, lip/ase breaks down lipids
lip/ase
lipase
Breaks down lipids
lactase
The enzyme that breaks down lactose, the main sugar in the milk of mammals
Lactose intolerance
Is a disorder caused by inadequate production of, or defect in, but enzyme lactase.
amylace
An enzyme that breaks down starch
preteinase or protease
Is an enzyme that breaks down proteins
Thirst
Is the desire for fluid, especially water. Not only does wander serves to transport food in the digestive track, but it is also the principle medium in which chemical reactions occur.
Carbohydrates
The basic source of energy for human cells; includes enclosed and starches
Digestion
Conversion of food into substances that can be absorbed
Elimination
Removal of undigested food particles
Mucosa (mucous membrane)
The digestive tract is lined with a mucous membrane, which secretes mucus for lubrication.
Muc/oid
Mucoid
Means resembling mucus
Muscular tube portion of the digestive tract
Consists of the upper G.I. tract in the lower G.I. tract
The accessory organs
Salivary glands, liver, gallbladder, and pancreas
Schematic of the pathway of food through the digestive tract
Digestion begins in the mouth (1). The teeth grind and chew the food before it is swallowed. The mask of chewed food is called a bolus.
The pharynx(2) passes the bolus to the esophagus (3), which leads to the stomach (4), where food is churned and broken down, chemically and mechanically.
The liquid mass, called chyme, is passed to the small intestine, where digestion continues and absorption of nutrients occurs. The three parts of the small intestine are shown: duodenum (5), jejunum (6), ilium (7).
Undigested food passes to the large intestine (8), where much of the water is absorbed. It is stored in the rectum until it is eliminated through the anus (9).
Bolus
Mass of chewed food
Esophagus
A muscular canal extending from the throat to the stomach.
chyme
A liquid mass
Three parts of the small intestine
1) duodenum
2) jejunum
3) ileum
1) about 25 cm, less than a foot, begins at the pyloric sphincter, and is the shorter section
2) below the duodenum, about 2.4 m (about 8 feet) long and joins the ileum.
The second portion is the jejunum which is continuous with the third portion.
3) is the distal portion of the small intestine. ileum is the longest part of the three parts of the small intestine.
Large intestine
1.5 meters (about 5 ft) long
Undigested food passes to the large intestine were much of water is absorbed
Rectum
The mass is stored in the rectum until it is eliminated through the anus
The lower part of the large intestine is the rectum, terminates in a narrow, anal canal. This canal intern opens to the exterior at the anus.
Summary of the pathway of food through the digestive tract ( upper & lower)
Starts with food at the mouth(1) where the salivary glands are, then goes to the pharynx (2) proceeds to the esophagus (3) and onto the stomach (4). Then in line where the Liver, Gallbladder and Pancreas are, the small intestine (5) starts.
A) deudonum
B) jejunum
C) ileum
Which then goes to the
Large Intestine (6)
A) Cecum
B) Ascending Colon
C) Transverse Colon
D) Descending Colon
E) Sigmoid Colon
F) Rectum
Then the Anus (7) then the elimination of feces (8)
Esophag/eal
Esophageal
Pertaining to the esophagus
Gastr/ic
Gastric
Pertaining to the stomach
Oro/pharyng/eal
Pertaining to the mouth and pharynx or pertaining to the oropharynx
Pharyng/eal
Pharyngeal
Pertaining to the pharynx
Intestin/al
Intestinal
Pertaining to the intestines
enter/ic
enteric
Pertaining to the intestines
Most medical words concerning the intestines are formed using enter enter(o), but a few terms use enter(o) to specifically mean the small intestines (for example, enter/itis, enteritis)
Enter/al
Means within, by way of, or pertaining to the small intestine
Enternal tube feeding
Introduce his food directly into the gastrointestinal tract
colon
The structure that comprises most of the large intestine and where much of the water is absorbed as the waste are moved along the rectum.
The colon is only that portion of the large intestine extending from the cecum to the rectum.
The colon makes up most of the 5 feet of large intestine.
Colonic
Means pertaining to the colon
colic
Means pertaining to the large intestine, but it also means spasm in any hollow or tubular, soft organ accompanied by pain
Infantile colic
Which is colic occurring during the first few months of life
Rectum
Which is the lower part of the large intestine
Anus
The outlet of the rectum, and it lives in the fold between the buttocks.
The anal canal is about 4 cm long solid ways are eliminated via the anus.
Rectal
Pertaining to the rectum, respectively
Anal
Means pertaining to the anus, respectively
Enter/itis
Enteritis
Inflammation of the small intestines
Oro/pharyng/eal
Oropharyngeal
Pertaining to the mouth and throat
Oral cavity
Is the beginning of the digestive tract (the oral cavity, esophagus, and the stomach comprise the upper digestive tract
Mouth structures
The mouth is bounded anteriorly by the lips and contains the tongue and teeth
Roof of the mouth
Is the hard palate
Other aspects of the mouth include
Gums, the uvula, the oropharynx, and the buccinator muscle (main muscle of the cheek that is involved in chewing)
Mandible
Lower jaw bone
Maxilla
Upper jaw bone
Palat/ine
Pertains to the pallet
Roof of the mouth
Is formed by the bony arch of the hard palate and the fibrous soft palate
bucc/al cavity
buccal
Means pertaining to the area between the teeth and the cheeks
Tongue muscle
Covered with mucus membrane, is the principal organ of taste, and assist in chewing and swallowing food
Gloss/al Glossal
Lingu/al Lingual
Means pertaining to the tongue. Most words involving the tongue who is the combining form gloss(o)
Hypo/glossal hypoglossal
sub/lingual sublingual
Mean under the tongue
Beneath the tongue
Gingiva
Another name for the gum
Den/ture
Denture
Refers to a set of teeth, either natural or artificial, but is ordinarily used to designate artificial ones
Den/tal
Dental
Pertains to the teeth.
32 teeth in a full set
Mouth
The mouth has a upper and lower dental arch, the curving shape formed by the arrangement of a normal set of teeth in the jaw. 16 teeth in each Dental arch
Mandibul/ar
Mandibular
Lower jaw/pertaining to
Lower jaw. The 18th on each side of the dental arch make up a quadrant.
Mandibul (structure)
Teeth
In each quadrant
2 incisors
1 cuspids (canine)
2 bicuspids (premolar)
3 molars
Anterior teeth
generally fall out and are replaced sooner than posterior ones. The last molars, which is posterior to all teeth, is known as the wisdom teeth
Primary or deciduous teeth
(Baby teeth)
Begin to fall out in to be replaced with permanent teeth when a child is about six years of age. The wisdom teeth are the last two irrupt, usually between 17 and 25 years of age.
All teeth consist of two basic parts
Crown- portion of the tooth that normally Projects above the gums
The Crown is covered by enamel, the hardest substance in the back.
Rot or roots - embedded in the bony socket
Endodontium
The soft tissue inside the tooth is the dental pulp also called the……
or tooth pulp
Peri/odont/ium
Periodontium
around/teeth/tissue
The tissue around the teeth
The tissue investing and supporting the teeth
Peri/odont/al
Periodontal
Pertaining to/around/teeth
around the tooth or pertaining to the periodontium.
Specialties in dentistry
1) endodontics - endodontist
2) orthodontics - orthodontist
3) periodontics - periodontist
4) gerodontics - gerondontist
5) pedodontics - pedodontist
Endodontics
Diagnosis and treatment of diseases of the dental pulp, tooth root and surrounding tissues, and the associated practice of root canal therapy
Orthodontics
Diagnose and treatment of the irregularities of the teeth, including straightening.
Orthodontist often uses braces to straighten the teeth
Periodontics
Study and treatment of the periodontium by a periodontist
Practitioner who specializes in the gums and other tissues, that support the teeth.
periodontium the tissues, investing, and supporting the teeth
gerodontics
Dental, diagnosis, prevention, and treatment of older persons; the specialist is a gerodontist
Pedodontics
Study and treatment of children’s dental needs; the specialist is a pedodontist
Dentil
Denti/lingu/al
Dentillingual
teeth/tongue/pertaining to
pertaining to the teeth and tongue
gingiv/al
gingival
gums/pertaining to
pertaining to the gums
glosso/pharyng/eal
glossopharyngeal
tongue/pharynx/pertaining to
Pertaining to the tongue in pharynx
inter/dent/al
Interdental
between/teeth/pertaining to
pertaining to between the two
maxill/ary
Maxillary
maxilla/pertaining to
pertaining to the maxilla (upper jaw)
Lingu/al
Lingual
Tongue/ pertaining to
Pertaining to the tongue
Palat/ine
Palatine
Palate/pertaining to the roof of the mouth
inter/dent/al
Between/teeth/pertaining to
Three pairs of salivary glands
Par/otid -
parotid- the largest salivary gland are near the ears
sub/lingual
sublingual- are located under the tongue
Sub/mandibular
Submanibular- are located in the tissue of the lower jaw, rather than beneath it as the name implies
Consist of numerous lobes connected by vessels and ducts
Salivary glands
Which are accessory organs of digestion, secrete saliva into the oral cavity. The mouth taste what we consume and performs other functions of digestion by mixing the food with saliva, chewing, and voluntarily swallowing it.
Saliva
Contains amylase, which begins digestion of starch in the mouth
Food that is swallowed
Passes from the mouth to the pharynx and the esophagus. Both the pharynx and the esophagus are muscular structures that move food along on its way to the stomach.
Esophagus
Is a muscular canal extending from the pharynx to the stomach.
The esophagus, about 24 cm 9 1/2 inches) long, secretes mucus to facilitate the movement of food into the stomach. Upper and lower esophag/eal (esophageal) sphincters control the movement of food into an out of the esophagus
Sphincter
(G) that which binds tight) consist of circular muscle that constricts a passage or closes a natural opening in the body
post/esophag/eal
Means situated behind the esophagus
Regions of the stomach
Cardiac region
Fundus (round)
The body (middle portion)
Pyloric region or pylorus, which is the small distal end
Cardiac sphincter
Guards the opening of the esophagus into the stomach and prevents backflow of material into that esophagus
Pyloric sphincter
The stomach ends with the pyloric sphincter, which regulates overflow
Rugae
The lining of the stomach, the mucosa, is arranged in temporary folds called rugae (visible in the empty stomach), which allow expansion as the stomach fills
The rugae, most apparent when the stomach is empty, allows the stomach to expand as it fills
Structure of the stomach wall
Longitudinal, circular, and oblique, smooth muscle lie just beneath the serosa. All stomach layers are richly supplied with blood vessels and nerves.
Gastric glands
Secrete, gastric juice through gastric pits, tiny holes in the mucosa
Three layers of smooth muscle (structure of the stomach wall)
Oblique
Circular
Longitudinal
These lie just beneath the serosa
Serosa most outer layer
Longitudinal
Circular
Oblique
Blood vessel
Submucosa
Lymph nodes
Gastric glands
Mucosa which ends on the inner side of the stomach
Pyloric sphincter
The stomach ends with the pyloric sphincter, which regulates the outflow of stomach contents into the duodenum
Duodenum
The first part of the small intestine
Mucosa
Lines the stomach and is arranged in temporary folds, called the rugae
Ruga (singular for rugae)
Means ridge, wrinkle, or fold
Serosa
The outer layer, membrane, of the stomach. This type of visceral peritoneum holds the stomach and position by folding back on an over the structure.
Chyme
(Liquefied food)
The stomach is a temporary reservoir for food, and is the first major site of digestion. After digestion, the stomach gradually feeds liquefied food (chyme) into the small intestines
Gums
Gingiva
Intestines
Includes the small intestines and the large intestines
Make up the lower digestive tract. The intestines are sometimes called the bowels. Extending from the pyloric opening to the anus, the intestinal tract is about 7.5 to 8.5 meters (m) long (about 24 1/2 to 28 feet)
The adult, small intestine, comprising more than 3/4 of the length of the intestines, is 6 to 7 m (about 20 to 23 feet) long. The large intestine is so named because it is larger in diameter than the small intestine, but it is less than 1/4 as long.
Small intestine
-Longer than the large intestine
-Finishes the process of digestion
-Absorbs nutrients
-And passes the residue onto the large intestine.
The small intestine is responsible for two successive processes, digestion and absorption, before passing the residue to the large intestine.
Note that the small intestine decreases in diameter from its beginning at the duodenum to its ending at the ileum
ile/ac ile/al
ileac. ileal
Means pertaining to the ileum (distal portion of the small intestine) (third part of the small intestine)
Duodenal
jejunal
Means pertaining to the duodenum
means pertaining to the jejunum
Internal structure of the small intestine
Is similar throughout its length. The wall has an inner lining of mucosa, two layers of muscle, and an outer layer of serosa. The mesentery, the fan shaped fold of peritoneum, suspends the jejunum and ileum from the dorsal wall of the abdomen
Internal structure of small intestine
1) mucosa-innermost membrane. Both mucosa and submucosa have many folds and finger like projections called villi. (function to absorb nutrients.)
Villi
Manifolds and fingerlike projections
Folds & fingerlike projections
Increases the surface area of the mucosa.
Large intestine
Automatically divided into the cecum, colon, rectum, and anal canal
Location in parts of the large intestine
Vermiform Appendix
Cecum
Ascending colon
Transverse colon
Descending colon
Sigmoid colon
Rectum
Anus
Distal
Refers to distance
ileo/Cecil valve
Is located between the ileum and the cecum. Retro/cecal (retrocecal) means behind the cecum.
Vermiform appendix
Is a worm like structure that opens into the cecum. An appendix simply means an appendage, but its most common usage is in referring to the vermiform appendix just described.
Appendicular
Means either pertaining to an appendage or pertaining to the variform appendix
Sigmoid colon
The last part of the colon
Retro/col/ic
Retrocolic
Pertaining to behind the colon
Peri/col/ic
Pericolic
Means pertaining to the tissue around the colon. In this term, “ the tissue around the structure” is implied
Features of the large intestine
Cecum
Appendix
Colon
Rectum
Double set of circular muscles
Internal sphincter and external sphincter
Surround the anus and control the discharge of fecal material
Defecation
Is the elimination of feces from the rectum
Colo/rectal
Colorectal
Means pertaining to or affecting the colon in the rectum
Procto/logist
Proctologist
Specializes in treating disorders of the colon, rectum, and anus
Gastro/enterology
Gastroenterology
Is the study of the stomach and intestines and associated diseases
Large intestine has several important functions
While moving wastes along its length, the large intestine absorbs water, sodium, and chloride. The large intestine is capable of absorbing 90% of water and sodium it receives.
The large intestine, secretes, mucus, which Bynes vehicle particles into a form to mass and lubricates the mucosa.
Bacteria in the large intestine are responsible for the production of several vitamins
Feces are formed and expelled from the body
retro/cec/al
retrocecal
Pertaining to behind the first portion of the large intestine
Behind the cecum
ile/al
Liver
Major function of producing bile. The bile is then transported to the gallbladder for storage.
Liver functions
-most commonly known - the formation and excretion of bile for digestion of fats
1) production of bile
2) breakdown of toxic compounds
3) involvement in the regulation of blood glucose
4) lipid metabolism
5) synthesis of plasma proteins
6) storage of iron in certain vitamins
7) filtering of the blood
8) excretion of bile pigment from the breakdown of hemoglobin
9) excretion of hormones and cholesterol
biliary
Means pertaining to bile
but chol(e) is used more often to write terms
biliary tract
The organs in the ducts that participate in the secretion, storage, and delivery of bio make up the biliary tract. Bile leave the liver by the hepatic duct and is taken to the gallbladder for storage until it is needed.
Bile
Is stored in the gallbladder and released when fats are ingested
Pancreas
Secretes, many substances, including digestive, enzymes, and insulin
Is both digestive and hormonal functions
This elongated gland stretches transversely across the posterior abdominal wall
Pancreatic juice
Place an important role in the digestion of all classes of food.
Pancreatic juice contains lipase, amylase, and several other enzymes that are essential to normal digestion.
The pancreas also produces hormones, including insulin that play a primary role in the regulation of carbohydrate metabolism.
Clusters of cells in the pancreas
(the islets of Langerhans)
Produce glucagon and insulin
Glucagon
Increases blood glucose levels
Insulin
Lowers blood glucose levels
Blood glucose
The two hormones, glucagon and insulin work together to regulate blood glucose.
Hypo/glycemia
Hypoglycemia
Is a decreased level of glucose in the blood
Secretion of glucagon is stimulated by hypoglycemia
small amounts of insulin are secreted continuously in the fasting state, but secretion rises in response to the increase in blood glucose levels
Hyper/glyc/emia
Is greater than normal amount of sugar in the blood. This condition is often associated with diabetes mellitus.(DM),
primarily a result of insufficient production or improper use of insulin.
cholecystic
Pertaining to the gallbladder
cholecystogastric
Pertaining to the gallbladder and the stomach
choleochal
Pertaining to the common bile duct
extrahepatic
Situated or occurring outside the liver
Hepatic
Pertaining to the liver
Hepatotoxic Sometimes called hypatolytic
Destructive to the liver, sometimes called hepatolytic
Pancreatic
Pertaining to the pancreas
Suprahepatic
Situated about the liver
Diagnostic test and procedures
Physical assessment of the G.I. system
Begins with an examination, the patient’s mouth, pharynx, and abdomen
A systematic assessment of the internal abdominal organs can be made using auscultation , percussion and palpitation.
Diagnostic test and procedures
Assessment of the intestinal tract
Has been greatly facilitated by radiology and endoscopy(direct visualization of internal organs using an endoscope), revealing abnormalities, such as masses, tumors, and obstructions. And abdominal x-ray is usually one of the first radiographic studies performed.