Test 5- Digestive System Flashcards
Basic pathway of the digestive system
mouth oral cavity tongue pharynx esophagus stomach small intestine large intestine rectum anus
Secretes digestive enzymes into the alimentary canal
salivary glands
pancreas
liver
4 stages of food processing
ingestion
digestion
absorption
elimination
Space between teeth and cheeks
Buccal cavity
Space between lips and teeth
Vestibule
Forms the roof of mouth
Hard and soft palates
Posterior portion of soft palate
Uvula
Inferior portion of tongue attaching to base of the oral cavity
Frenulum
Tongues point of attachment
Root
Anterior portion of tongue
Body
Produce saliva to clean mouth and teeth and moisten bolus
Salivary glands
3 pairs of salivary glands
parotid
sublingual
submandibular
On lateral side of face, anterior to ear, enters oral cavity at 2nd upper molars
Parotid salivary gland
8-20 ducts empty saliva into the floor of mouth
Sublingual salivary gland
On medial surface or mandible, empty on either side of the lingual frenulum
Submandibular salivary gland
Portion of tooth below the gum line
Root
Exposed surface of teeth
Crown
Hard outer surface of tooth made of calcium
Enamel
Inner matrix of tooth
Dentin
Hollow inside of tooth, containing vessels and nerves
Pulp cavity
Canal running the length of the root
Root canal
Where gum and tooth meet
Gingival sulcus
Front cutting teeth
Incisors
Conical, tearing teeth
Cuspids (canines)
Crushing, grinding teeth (2 roots)
Bicuspids
3 or more roots- also crush and grind
Molars
Lip/cheek side of the oral cavity
Labial/buccal side
Tongue side of the oral cavity
Lingual/palatal side
Faces away from last molar
Mesial side
Faces toward the last molar
Distal side
Surface that touches other teeth when the teeth are closed against each other
Occlusal surface
Connects oral cavity to esophagus and is involved in swallowing
Pharynx
Reflex when food ends the pharynx
larynx rises
glottis closes
epiglottis flips down over glottis
4 layers of the digestive tube
serosa
muscularis
submucosa
mucosa
Outside layer of CT and peritoneum
Serosa
Muscular layer of the digestive tube
Muscularis
CT with glands, nerves and blood vessels in the digestive tube
Submucosa
Innermost layer of the digestive tube, faces lumen
Mucosa
Made of epithelium, CT and muscle
Mucosa
First segment of the digestive tract and is about 10 inches long
Esophagus
2 sphincters of the esophagus
pharyngoesophageal
lower esophageal
Where the esophagus joins stomach
Lower esophageal sphincter
Rhythmic contraction of digestive tubes
Peristalsis
Begins the esophagus, continues through the entire tract, pushing the bolus along
Peristalsis
Irritation in stomach or small intestine can reverse a peristalsis
Antiperistalsis
Acid from stomach moves into the esophagus, irritating the mucosa
Heartburn
Causes of heartburn
- weakened lower esophageal sphincter due to fats, alcohol
- hiatal hernia
- increased pressure due to obesity
Weak spot in diaphragm allows stomach to move upward
Hiatal hernia
3 segments of the small intestine
Duodenum
Jejunum
Ileum
Receives bile to emulsify fat
Duodenum
An emulsifying agent that is made by the liver and stored in the gall bladder
Bile
Breaks fat into small particles so it can mix with enzymes and water
Emulsifying agent
Second segment of the small intestinf
jejunum
Further digests and absorbs food molecules
Jejunum
3rd segment of the small intestine
Ileum
Further digests and absorbs food molecules and ends at the ileocecal valve (between the ileum and cecum)
Illeum
End of the small intestine
ileum
Beginning of large intestine
cecum
Absorbs water and electrolytes and prepares and stores undigested material (feces)
large intestine
Bag like section, has wormlike appendage called the vermiform appendix
Cecum
4 segments of the large intestine
- ascending colon
- transverse colon
- descending colon
- sigmoid colon
6-7 inches long and has 3 folds to support fecal material
rectum
goes through body wall to exterior and ends in the anus
Anal canal
Dilated veins in anal canal that result from irritation of mucosa or pressure from pregnancy or hard stool
Hemorrhoids
Infected and swollen appendix
Appendicitis
Too much water is left in the intestine to rid the body of bacteria
diarrhea
Too much water is absorbed in the intestine, leaving dry, hard stools
Constipation
The development of diverticula (sac like appendages in the walls of the large intestine)
Diverticulosis
Inflamed diverticula
Diverticulitis
Caused by a low fiber diet
Diverticulitis
Growths from epithelial tissue of mucosa of large intestine and can become cancerous
Polyps
Lower part of rectum and anal canal removed, so an artificial opening in the abdominal wall can be surgically formed and fecal material is collected in a bag
Colostomy
Accessory organs in digestion
Liver Gallbladder Duodenum Bile Duct Pancreas
Has endocrine and exocrine functions
Pancreas
Secretes substances directly into the blood
endocrine glands
Secretes substances through ducts
Exocrine glands
Endocrine functions
secretes glucagon to increase blood glucose
Secretes insulin to decrease blood glucose
Exocrine functions
Secretes pancreatic juice
- lipase: digests fats
- amylase: digests carbs
- trypsin: digests proteins
Results from a blocked duct
acute pancreatitis
Largest gland of the body located mainly in the URQ of the abdomen
Liver
Liver functions
- stores glucose as glycogen
- breaks down amino acids from proteins
- destroys old RBC’s
- produces bile
- removes toxins from the blood
- stores vitamins A,D,E,K
Liver breaks down hemoglobin and old cell pieces that pass through the blood
Bile formation
Contains high amounts of cholesterol and is sent to the gall bladder to be stored
Bile
Scar tissue replaces normal healthy tissue, blocking blood flow through the organ and preventing it from working as it should
Cirrhosis of liver
Usually caused by alcoholism or hepatitis C
Cirrhosis
Stores biles and squirts bile into small intestine
Gall bladder
Works on small particles of fat in the small intestine and digests them
Lipase
Yellowing of skin, conjunctive and mucous membranes due to deposit of bilirubin
Jaundice
Bile ducts are obstructed so bile cannot drain out of the liver and overflows into the blood
Obstructive jaundice
Caused from RBC’s being broken down in large quantities
Hemolytic jaundice
Immature liver cannot excrete the bilirubin as quickly as it is being formed
Physiologic jaundice
Disease of the liver commonly occurring in newborns
physiologic jaundice