GI Flashcards
What is propulsion along GI tract called
Peristalsis
Main function of GI tract
Supply nutrients to body cells
Taking food and moving it along the GI tract
Ingestion&Propulsion
Breakdown of food
Digestion
Transfer of food products into circulation
Absorption
Excreting the waste products of digestion
Elimination
How long is the GI tract? From where to where ?
30 feet
Mouth to anus
4 layers of entire GI tract
Mucous
Submucosa
Muscle
Serosa
What does Parasympathetic NS do when dealing with GI
Excitatory
What does sympathetic NS do when dealing with GI
Inhibitory
What in the GI tract sends signals to the ANS
Sensory fibers
Peristalsis in increased by _________ and decreased by __________ stimulation
Increased by parasympathetic and decreased by sympathetic
What is the enteric nervous system also known as
GUT BRAIN
Numerous neurons control movement and secretion of the GI tract
Enteric Nervous System (GI tract “nervous system”)
How much cardiac output does the GI tract receive
25-30%
The GI tract is a network of circulation connected to what 3 things
Vena cava
Spleen
Liver
A large amount if blood supply is diverted from the digestive system when?
During exercise/stress
What is mixing and propulsion called
Peristalsis
What does not have any enzymes or hormones in it
Esophagus
What are the 3 secretions of the GI tract
- enzymes and hormones for digestion
- mucus for protection and lubrication
- water and electrolytes
Peritonitis is an ___________
Emergency
Lines the abdominal cavity wall
Parietal
Covers the abdominal organs
Visceral
Space between the parietal and visceral layers
Peritoneal cavity
What is the peritoneum
2 layers that cover the abdominal organs
What blocks the trachea
Epiglottis
What is the job of the lower esophageal sphincter? Why does it need to close?
Wants food is in the stomach it closes. It has to close so you don’t get stuff from the stomach going back up. You don’t want any reflux of contents to leak back into the esophagus!
If something is wrong with the stomach what vitamin may you end up becoming deficient in?
B12
What gastric secretions and mixed with the food when it is stored in the stomach? Parietal cells: Chief cells: Pyloric gland: Intrinsic factor:
Parietal cells: HCl
Chief cells: pepsinogen
Pyloric gland: gastrin
Intrinsic factor: cobalamin (vit B12)
Once food becomes chyme what is it ready to do
Ready to enter the small intestine for further digestion and absorption
Once food is chyme what stimulates the motility and secretions
Pepsinogen
Lots of ______ secrete mucus and produce intestinal digestive enzymes
Villi
It is more ________ in the small intestines
Alkaline—less acidic
Once food arrives to the large intestines what are the 4 parts it has to go through
Cecum/appendix
Colon- ascending, transverse, descending
Rectum
Anus
Most important part of large intestinal function
Absorption of water and electrolytes
The large intestines secretes lots of _______ for ________ and ________ and stores _________.
Lg intestines secretes lots of mucus for lubrication and protection and stores feces
Is the movement in the large intestine fast or slow? What type of peristalsis occurs?
Movement is very slow, propulsive peristalsis occurs
What type of action is defecation?
Reflex action—> involuntary and voluntary control
What is the last thing kids develop
Sphincter control