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Prep4USMLE Forum » USMLE Step 1 Forum » Physiology Forum

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5 Posts

mitty
Forum Guru

Topics: 52
Posts: 376

08/10/06 - 02:48 PM

A soft-walled cannula containing a pressure transducer is placed at a location distal to the ileocecal valve in a healthy adult subject. Resting pressures measured over a 1-hour baseline period ranged from 20 to 25 mm Hg above atmospheric pressure. Intraluminal pressure measured at the cannula location fell to 0 mm Hg when the immediate upstream segment of gastrointestinal tract was distended. No defecation occurred upon this stimulus. What is the location of the pressure sensor?

A. Ascending colon
B. Cecum
C. Descending colon
D. External anal sphincter
E. Internal anal sphincter
F. Rectum
G. Sigmoid colon
H. Transverse colon

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PatriciaLim
Forum Senior

Topics: 13
Posts: 54

08/20/06 - 04:08 PM

Rectum?

icemaiden
Forum Elite

Topics: 9
Posts: 117

08/20/06 - 04:55 PM

khorshid
Forum Guru

Topics: 32
Posts: 591

08/23/06 - 09:24 PM

I'll go with E too

muzammil
Forum Guru
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Topics: 16
Posts: 654

08/24/06 - 01:18 PM

i will go e
i dont think the resting pressure in rectum is 20 - 25 higher than atmospheric pressure and not external sphincter bcz it wud have produced defication on relaxation.

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