Large and Small intestine Flashcards
The hormones gastrin, CCK, motilin, and serotonin all promote what in the small intestine?
All of these hormones promote motility within the small intestine.
How does the mucosal surface of the large intestine differ from the mucosal surface of the small intestine?
The large intestine does not have villi and there are far more goblet cells present in the large intestine.
Haustrations are seen in what form of Large intestine motility?
Lack of haustrations are seen in what form of large intestine motility?
Haustrations are seen in mixing movement.
Haustrations are absent in propulsive movements of the large intestine.
Movement of colonic contents through the proximal and transverse colon may take how much time?
Can take 8-15 hours!
The defecation reflex can be split into what two separate reflexes?
It can be split into the intrinsic reflex and the parasympathetic defecation reflex.
The intrinsic reflex of defecation is initiated by what?
Distension in the distal colon signals to the enteric nerves of the myenteric plexus initializing the reflex causing flexing in the descending colon, sigmoid colon, and rectum forcing feces to the rectum.
What role do parasympathetics play in the intrinsic reflex of the defecation reflex?
Parasympathetics are activated following the initial intrinsic reflex causing increased contraction forcing feces towards the anus.
Although Chrons disease can infect any area of the GI tract, it is most often associated with which segment?
Commonly associated with the ileum.
The site of origin for Crhons disease is where?
The submucosa, it then eventually will spread to the mucosa and serosa causing a pattern of skip lesions!
What organ does ulcerative colitis effect and where does it originate
Predominantly effects the Large intestines originating in the crypts of leiberkhun.
A quarter of inflamatory bowel disease will also present with what symptoms?
Joint pain or arthritis or increased prevelance of osteoporosis!
Impaired water and electrolyte uptake is also seen leading to dehydration.
This is helpful in differentiating between irrital bowel syndrome.
Majority of patients presenting with diverticulitis present with the infection within what section of the colon?
Typically they will present with diverticulitis within the sigmoid colon.
Constipation, megacolon, and narrowing of a segment of the colon are all trademarks of what disease state?
Hirschsprung’s disease, a congenital disorder occurin during development due to loss of the submucosal plexus and myenteric plexus.
