Digestive System Flashcards
locations of salivary glands
parotid, mandibular, sublingual, and molar
what is the front portion of the roof of the mouth?
hard palate
what is the back portion of the roof of the mouth?
soft palate
what are the folds of the stomach? what are their function?
rugae; to increase surface area of the stomach to increase volume
connects nasal cavity and soft palate
nasopharynx
connects soft palate and hyoid bone
oropharynx
most caudal portion of the pharynx
laryngopharynx
this structure connects pharynx to stomach
esophagus
tissue that connects top lip to gums
labial frenulum
tissue that connects tongue to mouth
lingual frenulum
tonsils located laterally to oropharynx
palatine tonsils
protrusions on the taste buds that contain taste buds
papillae
canine deciduous formula
I3 C1 P3
canine adult formula
I3/3 C1/1 P4/4 M2/3
feline deciduous formula
I3 C1 P3
feline adult formula
I3/3 C1/1 P3/2 M1/1
teeth on the very front of the jaw used for cutting
incisors
long, sharp teeth used for biting and tearing
canines
teeth used for crushing and grinding
premolars and molars
part of tooth that contains nerves and blood vessels
pulp
outside covering of teeth (stronger than bone)
enamel
layer below the enamel that makes up the bulk of the tooth
dentin
bone-like covering over roots
cementum
what are the layers of the GI tract
mucosa, submucosa, muscular layers, serosa
area where esophagus enters the stomach
cardia
most cranial portion of the monogastric stomach
fundus
the largest portion of the monogastric stomach
body
most caudal portion of the monogastric stomach
antrum
the sphincter that closes off the stomach to the duodenum
pyloric sphincter
what is the first chamber of the ruminant stomach that is the primary site for microbial fermentation aka the paunch?
rumen
what is the second chamber of the ruminant stomach that digests food particles? aka the honeycomb
reticulum
what is the third chamber of the ruminant stomach that further digests food particles? aka “book stomach”
omasum
what is known as the true stomach in ruminants?
abomasum
links esophagus to omasum and bypasses reticulorumen
esophageal groove
what enzyme is released for milk protein coagulation in young ruminants
rennin
ingesta moves up from reticulorumen ro oral cavity for further breakdown and more saliva (chewing cud)
rumination
gases released during fermentation so animal doesnt bloat
eructation
what is the first portion of the small intestines which connects to pyloric sphincter?
duodenum
what is the name of the structure where the bile duct and pancreatic duct meet? it allows digestive juices to meet and break down food (chyme)
ampulla of vater
what is the middle portion of the small intestine where chemical digestion and absorption occur?
jejunum
what is the last portion of the small intestine?
ileum
permanent folds in mucosal lining
plications
help moves contents through intestines
villi
house cells that replace worn out cells
intestinal crypts
where does the ileum empty into in a horse?
cecum
where does the ileum empty into in dogs and cats?
colon
where does the ileum empty into in ruminants?
cecum and colon
capillaries carry lipids that are too large to thoracic duct into vena cava
lacteals
pear shaped organ that stores and releases bile for digestion
gallbladder
location of gallbladder
upper right quadrant of the abdomen under the liver
structure that drains bile from gallbladder and joins with hepatic and bile ducts
cystic duct
structure that drains bile from the liver
hepatic duct
where hepatic and cystic ducts join
common bile duct
what is the function of the pancreas for digestion
to release enzymes into the pancreatic duct where it joins with the bile duct to digest food in the duodenum
what hormone is produced to lower blood sugar
insulin
what hormone is produced to raise blood sugar
glucagon
what enzyme breaks down lipids into FFAs and monoglyceride
lipase
what enzyme breaks down starches into maltose
amylase
what enzyme breaks down proteins into amino acids
proteolytic enzymes (proteases)
composition of bile
bile salts, phospholipids, cholesterol, bile pigments
4 parts of large intestine
cecum, colon, rectum, anus
why is the large intestine considered larger than the small intestine
wider in diameter
functions of the liver
-digestion and absorption
-excretes toxic substances
-produces plasma protein, cholesterol, and blood coagulation factors
how many lobes does the liver have
6
how does the liver receive blood
hepatic portal vein and hepatic artery
the hepatic portal vein, hepatic artery, and bile duct creates what
triad
how does the liver excrete bile
via hepatocytes into the canaliculi to the bile duct
bile is necessary for…
lipid digestion in the intestines
what are the bulging sac-like structures of the large intestine
sacculations or haustra
most common type of movement of the large intestine
segmentation
what is another type of movement in the GI tract
peristalsis
what is the term for moving backwards towards the stomach to allow more time for absorption
antiperistalsis
what are the 3 parts to the colon
ascending, transverse, descending
what organ stores and filters blood, produces white blood cells and antibodies, and maintains fluid balance
spleen
location of the spleen
left abdomen above the stomach
bringing food in
prehension
chewing
mastication
swallowing
deglutition
shallow depressions dot the mucosal surface lined by glandular cells
gastric pits
protects mucosa against gastric acid
alkaline mucus
rugae very prominent here, glanular regions have different cells that produce secretions
fundus
last glandular portion of the stomach which narrows into a canal
pylorus
determines the rate of gastric emptying
pyloric sphincter
what phase starts when an animal anticipates a meal
cephalic phase
the cephalic phase causes a secretion of _______ into the stomach and _______ into the blood stream
pepsinogen, gastrin
this phase begins when food enters stomach
gastric phase
what is stimulated by stomach walls stretching
glandular cells
secretions of HCl results in a pH of the stomacha as low as
2.0 (lemon juice)
what regulates and controls the rate of gastric contents released into the small intestine
“pacemaker cells” controlled by autonomic nervous system
when large particles of food cannot pass through sphincter and are forced back for further breakdown
retropulsion
neurotransmitters and hormones can affect stomach motility and rate of gastric emptying
neurohumoral control
motility of stomach decreases and food enters and increases as it reaches pyloric region, these opposing responses are a result of
vagal nerve stimulation
hormones for gastric emptying
secretin, cholecystokinin, and gastric inhibitory peptide
second phase of digestion
chemical digestion
chemical reaction in which bond is broken by insertion of water molecule
hydrolysis
short chain polymers are broken down into basic components
membranous
what enzyme begins carbohydrate digestion in the saliva
amylase
what enzymes breaks down protein that begins in the stomach and continues to small intestines
proteolytic enzyme (proteses)