digestive system Flashcards
breaking down food chemically or mechanically
digesstion
the elimination of feces (unabsorbed materials) from the body
defacation
eating
ingestion
swallowing and peristalsis pushes food thru the GI tract
propulsion
digestive organs create and release enzymes and acids
secretion
nutrients pass from the GI tract into the bloodstream
absorbtion
uses certain enzymes/chemicals to break down nutrients
chemical digestion
physically breaking down food substances into smaller particles
mechanical digestion
aka alimentary canal
GI tract
aka GI tract
gastrointestinal tract
pathway that food follows from ingestion to defacation
GI tract
food does not enter them, but they help with the process of digestion
accessory organs
includes mouth, salivary glands, pharynx, esophagus, stomach, small intestine, large intestine, rectum, anus
GI tract
digestion is just the _ of food thru the body and does not include filtering or _ of wastes
flow, elimination
includes teeth, tongue, liver, gallbladder, pancreas
accessory organs
order of digestion
mouth, salivary glands, esophagus, cardiac sphincter, stomach, small intestine, (liver, pancreas, gallbladder - attached to small intestine), nutrients absorbed by villi and go to bloodstream, leftover stuff goes to large intestine/colon, water is removed to make feces and then it is defacated
what are the accessory organs of the digestive system that are not part of the gi tract?
teeth, tongue, liver, gallbladder, pancreas
what are the 3 parts of the small intestine?
duodenum, jejunum, and ileum
what valves separate the esophagus and stomach
cardiac sphincter
what valves separate the stomach and the duodenum
pyloric sphincter
what valve separates the ileum and colon
ileocecal valve
what are the 3 parts of the large intestine/colon
ascending, transverse, and descending colon
what are the functions of the liver and gallbladder
- liver: produce bile and export it to the duodenum
- gallbladder: primarily stores, concentrates, and releases bile
what’s the function of the pancreas
produces enzymes that help to digest food
whats the longest part of GI tract
small intestine
why is the small intestine longer than the large intestine?
it needs more volume to digest and absorb nutrition, because it is the main place where it occurs
what would pass through the lumen of the esophagus
chewed and softened food
what is the importance of the gastric lumen and gastric pits in the stomach
- lumen: mixes food with stomach juices
- pits: release juice to break down food
what is the importance of the villus in the small intestine?
they increase the volume of the small intestine so it can intake more food
whats the importance of goblet cells in the large intestine
they produce mucus that protects the large intestine form digestive fluids, and helps food move more smoothly
when standing up, water moves through the esophagus _. when laying down, water moves through the esophagus _.
faster, slower
is the speed of water affected by gravity
yes
what valve is between the esophagus and stomach
cardiac sphincter
whats the function of the digestive system
breaks down food and drink into small molecules that cells can use
what is the one way track through the digestive system called
GI tract
what are the organs of the GI tract
mouth, esophagus, stomach, small intestine, large intestine, colon, rectum, anus
what is the function of the mucosa tissue layer
creates digestive juices that break down food
what is the function of the muscularis mucosae tissue layer
assists in moving food thru GI tract
what is peristalsis
rhythmic contraction and relaxation of muscularis mucosae
where does carb/starch digestion occur
mouth
where does protein digestion occur
small intestine
where does lipid digestion occur
small intestine
where does absorption of nutrients occur
small intestine
what is a colonoscopy
camera is up anus to search GI tract
what is esophagogastroduodenoscopy
camera is down throat to search GI tract
what is an upper GI series
examines your esophagus, stomach and the first part of your small intestine (duodenum
what is lower GI series
examines the lower part of your small intestine (ileum) and your large intestine, including your colon and rectum
is blood in the stool normal
no