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gastrointestinal-tract-

  1. USMLE Step 1 Forum
    In FA , It is mentioned that diverticula termed "false in that they lack or have an attenuated musularis externa"... Any further explanation ??? I don't understand how "lack or have attenuated muscularis externa" in the same time? I know it is only mucosa and submucosa outpouch. and Does...
  2. USMLE Step 1 Forum
    Dr. Sattar in Pathoma said that we may find calcium oxalate stone in Crohn's Disease. But can we find calcium oxalate stone also in UC? Kindly exaplin. Also he said we might find megacolon in UC. But can a patint also develop megacolon in Crohn? Lastly, Since both the diseases inflam the...
  3. USMLE Step 1 Forum
    mutation increases NF-kb which increase cytokine production so it should produce strong response to microbes UWORLD says increase NF-kb cause inflamation causing bacteria to persist..how?
  4. USMLE Step 1 Mnemonics
    Hi all! I always have trouble remembering what becomes what when the stomach rotates 90 degrees clockwise. The embryonic ventral surface becomes the right side of the stomach while the original dorsal surface becomes the left. Likewise, the original left side becomes the ventral and the right...
  5. USMLE Step 1 Forum
    why the absorption of vitamin k in the small intestine is through lymphatic system but in the large intestine through blood vessels ?
  6. USMLE Step 1 Forum
    if someone could tell me what each side does.correct me if im wrong Left sided - smaller diameter - crampy/colicky - infiltrating mass - hematochezia(according to fa - which is where im confused) Right sided - larger diameter - obstructive - iron deficiency (again is there blood loss here as...
  7. USMLE Step 1 Forum
    Where is the location of the enzyme glucoronyl transferase in the hepatocyte? :confused:
  8. USMLE Step 1 Forum
    Hello Got a question about motilin. Motilin secretion is in increase in fasting state? Motilin supports digesting so I thought, motilin should be secreted after a meal.. Thanks in advance!
  9. USMLE Step 1 Forum
    in tylenol toxicity which zone is more susceptible 2 r 3?? 3 is around portal vein which gets least oxygen.. why is it around central vein.. can any one explain plss??
  10. USMLE Step 1 Forum
    66 year old male comes to hospital because he is not feeling well. He claims dark urine and pale stools for past 10 days. He also states that his skin is yellow since three weeks ago; which turns out to be painless jaundice. Examination of abdomem reveals no abnormalities. CT scan shows soft...
  11. USMLE Step 1 Forum
    This is what I have come to know so far, 1. In Gilbert syndrome jaundice occurs with fasting or increase in alcohol or phenobarbital intake. (Goljan) 2. Criggler-Najjar type II is less severe and responds to phenobarbital, which increase liver enzyme synthesis. (FA) While in Gilbert syndrome...
  12. USMLE Step 1 Forum
    58 year old male has significantly reduced reabsorption of bile salts resulting from the action of bile salt - binding resins. This is expected to lead to significant decrease in which of the following compounds? A. Aldosterone B. Cholestrol C. Cortisol D. Pregnenolone E. Progesterone
  13. USMLE Step 1 Forum
    I came to realize the importance of Liver in our bodies like never before. It's like the mother of body organs.. feeding them in the hour of need even while compromising it's own needs :( Biochemistry was an eye opener for sure Happy-2 !!!! There are a lot of facts dispersed about Liver here...
  14. USMLE Step 1 Forum
    An asymptomatic 56-year-old woman has occult blood in her stool. Barium studies of her transverse colon show an intraluminal mass. The surgical specimen is shown. Which of the following is the most likely diagnosis? A. Adenocarcinoma B. Carcinoid tumor C. Polypoid leiomyoma D. Tubular...
  15. USMLE Step 1 Forum
    10 year old girl enjoys a big helping of mashed potatoes. Which of the following is involved in the initial digestion of this macronutrient? A. Bile acids B. Pepsin C. Enterokinase D. Amlyase E. Gastric acid
  16. USMLE Step 1 Forum
    12 year old girl smells what her mother is cooking in the kitchen. She asks what time is father coming home. All of sudden and impatient, she complains that her stomach is grumbling and that she is salivating in anticipation of the meal. Which neurotransmitter is responsible for the girl's...
  17. USMLE Step 1 Forum
    What's the approx. time for the presentation of Intussusception, Pyloric stenosis and Hirschsprung's disease. I came across a lot of questions that talk about intestinal obstruction in newborn that don't give you the obvious hints (eg: projectile vomiting for pyloric stenosis) but just give you...
  18. USMLE Step 1 Forum
    Who can explain the mechanism of decreased H secretion in gastric ulcer caused by H. Pylori. And increased H secretion, caused by Duodenal H. Pylori infection?
  19. USMLE Step 1 Forum
    45 year old man presents to the physician with 3 month history of non - bloody, non - mucoid, non - oily watery diarrhea. He has a diastolic murmur that gets louder with inspiration and is best heard over the left lower sternal border. His face is warm and appears to be engorged with blood for...
  20. USMLE Step 1 Mnemonics
    ''THE MANCHESTER'' THE i.e. D =DYSPHAGIA, DYSARTHIA, DROOLING M= MICROSCOPIC HEMATURIA A= AMENORRHEA N= NEPHROCALEMIA C= CHOREA, COOMBS -IVE HEMOLITIC ANEMIA, CATARACT (SUNFLOWER) H= HEPATITIS E= - S= SPASTICITY/RIGIDITY T= TREMOR (RESTING/INTENTION) E= - R= RENAL TUBULAR ACIDOSIS/RECURRENT...
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