Digestive System Flashcards
What are the 4 functions of the digestive system?
1) Ingestion
2) Propel
3) Absorption
4) Excretion
What are the 2 types of “propel”
1) peristalsis (smooth movement)
2) segmentation (back and forth squeezing)
The digestive system is a “___________” from __________ to __________.
tube
mouth to anus
The digestive system allows food to be __________. Propels food, ____________ nutrients, and ___________ waste.
ingested
absorbs
expels
Digestive system vs digestive tract
Everything (system)
just the tube (tract)
What are the steps of the digestive tract?
mouth
pharynx
esophagus
stomach
small intestine
large intestine
What are the accessory organs/structures of the digestive system?
teeth
tongue
salivary glands
liver
pancreas
gallbladder
What is the inside of clenched teeth called?
oral cavity
what is the space between lips or cheeks and alveolar process called?
vestibule
What is another word for lips
labia
What is the oral cavity roof called?
palate
What is involved in speech , taste, mastication, swallowing
tongue
What structures are involved in the oral cavity?
mouth
lips and cheeks
palate
palatine tonsils
tongue
What is the name of the structure that connects lips to mandible or maxilla? It is a cord-like structure…
frenulum
(upper lip, tongue, and lower lip)
TRUE or FALSE
The teeth are a part of the digestive track.
FALSE
How many primary, deciduous, milk, childhood teeth are there?
20
How many permanent, secondary, or adult teeth are there?
32
What are the four types of teeth?
1) incisors (cutting)
2) canine (tearing)
3) premolar
4) molars (grinders)
How many incisors are there?
8
What is the anatomy of the teeth from top to bottom?
crown
neck
root
What is the crown made of?
enamel (the hardest part of human body)
What is the anatomy of the tooth from central to outside?
root canal/pulp chamber (nerve and blood supply)
->
dentin
->
cementum
->
enamel
What is the inside material of the tooth called?
dentin
What are the 3 salivary glands called?
1.) parotid
2) submandibular
3.) sublingual
What are the components of saliva?
1) Na+ and K + ions
2) immunoglobin A
3) mucin (lubricant)
4) salivary amylase
What does salivary amylase do?
breaks down simple carbs
Where is the parotid gland located?
anterior to the cheek (20-30% of saliva)
Where is the submandibular gland located?
underneath angle of mandible (60-70% of saliva)
Where is the sublingual gland located?
under tongue (3-5% of saliva)
Rank the salivary glands by size:
LARGEST = parotid
Middle = submandibular
smallest = sublingual
What parts of the pharynx are a part of the digestive system?
oropharynx and laryngopharynx
What are the 3 steps of deglutition?
1) initiation phase
2) pharyngeal
3) esophageal
What is the initiation phase? Where? Voluntary or involuntary?
uvula tenses and blocks throat and epiglottis forces it down the esophagus
tongue
voluntary
What is the pharyngeal phase? Where? Voluntary or involuntary?
move food to back of throat
pharynx (skeletal muscles)
involuntary
What is the esophageal phase? Where? Voluntary or involuntary?
peristalsis
smooth muscle
involuntary
The esophagus transports ______________ from pharynx to stomach.
bolus
The esophagus passes into abdominal cavity through esophageal hiatus of the ___________.
diaphragm
What are the 2 sphincters of the esophagus?
upper and lower (cardiac sphincter/gastroesophageal)
What is the purpose of the upper esophagus sphincter?
Located at the top of the esophagus, just below the throat. It’s made up of striated muscles and prevents air from entering the esophagus when a person is talking
What is the purpose of the cardiac sphincter?
Located at the bottom of the esophagus and top of the stomach. It’s made up of smooth muscles and allows food to pass into the stomach when a person swallows
What is a common “complication” of the cardiac sphincter?
acid reflux (heart burn)
Food that has been chewed and mixed with saliva in the mouth
Bolus
A fluid produced by the liver and stored in the gallbladder that helps with digestion.
Bile
Food that has been mixed with gastric juice. Enters the small intestine after passing through the stomach.
chyme
What are the parts of the stomach from most superior to inferior?
1.) cardiac sphincter (bolus)
2.) Fundus
3.) body
4.) pylorus (chyme)
What are the openings of the stomach called?
- gastroesophageal (esophagus)
- pyloric (duodenum)
What are the folds inside the stomach called (they increase the surface area)?
rugae
What are the layers of the smooth muscle of the stomach called?
longitudinal (outer)
circular (middle)
oblique (inner)
What are the layers of the stomach called?
serosa or visceral peritoneum (outermost)
muscularis
submucosa (nerves and vessels run)
mucosa
the small intestine has a primary role in the ________________ and _______________ of nutrients (90%).
ingestion and absorption
What are the three subdivisions of the small intestine?
1) duodenum (closest to stomach)
2) jejunum (middle)
3) ileum (before cecum)
What part of the small intestine is known as the “mixing bowl”? Why?
duodenum
chyme is put with digestive solution from liver, gallbladder, and pancreas
What part of the small intestine is the site of most chemical digestion and absorption?
jejunum
In the small intestine ______________________________ and _________________________ increase surface area for absorption.
Transverse folds (plicae circulares) and small projections (intestinal villi)
Intestinal juices moisten the __________, help __________ acids, and hold enzymes and products of digestion in solution.
chyme
buffer
What adds digestive juices to chyme?
liver
What separates the left and right lobe of the liver?
round ligament
Where does the gallbladder sit?
Inferior middle border of the right lobe of the liver
What lobe of the liver is the inferior vena cava sitting?
right lobe
What are the major and minor lobes of the liver?
Major: left and right
minor: caudate and quadrate
Which major lobe houses the minor lobes?
right
Which lobe of the liver is the location of the hepatic duct, hepatic portal vein, and hepatic artery?
right lobe
What is the purpose of the left and right hepatic ducts?
drains the liver
What does the common hepatic duct merge?
right and left hepatic ducts
What is the major duodenal papilla?
opening where fluid leaves one structure and goes into another
What does the cystic duct drain?
gallbladder
What is the common bile duct consisted of?
common hepatic duct and cystic duct
How did Dr.Brumels describe the purpose of the hepatopancreatic ampulla?
car wash for the magic school bus in the spleen to the liver
What organs are involved with the common bile duct?
liver and gallbladder
Where is the pancreas relative to the stomach?
the pancreas is posterior to the stomach
What is the purpose of the gallbladder? What color is it?
emulsify fat
green
The pancreas is both a ____________ and ________________ gland.
endocrine (into blood directly) and exocrine (secretes onto a surface)
The ___________________ gland of the pancreas involves the pancreatic islets, and they produce ______________ and ________________.
endocrine
insulin and glucagon
The ___________________ gland of the pancreas involves the _______, and they produce _____________.
exocrine
acini, digestive enzyme
The head of the pancreas is near which organ? What about the tail?
duodenum
spleen
The small intestine starts with the ___________________ sphincter at the ___________ section of the ___________________.
pyloric
pyloric
stomach
In the small intestine, digestive juices from liver, gallbladder, and pancreas are added at ___________________ _________________.
Hepato-pancreatic ampulla
What are the three regions of the small intestine?
Duodenum, Jejunum, and Ileum
The small intestine ends at the _________________________ junctions/sphincter.
Ileo-cecal
What are the portions of the large intestine/colon called?
ascending
transverse
descending
sigmoid/rectal
The right colic flexure of the large intestine is near the ____________, while the left colic flexure is near the ______________.
right = liver (hepatic colic flexure)
left = spleen (splenic)
The ___________ _______________ is off of the cecum.
veriform appendix
What two things assist with movement and absorption of bolus?
haustra and tenia coli
The haustra and tenia coli __________ and help with continual _________________ of waste.
pack
movement
The haustra are mainly involved with __________, while tenia coli are mainly involved with ________________.
segmentation = haustra
peristalsis = tenia coli
What are abnormal growths inside the colon?
polyps