Jackofknives
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A 24-year-old man received a knife wound to the abdomen that severed the superior mesenteric artery. The patients was admitted to the emergency department. Upon examination, it was determined that the patient was in circulatory shock as a result of blood loss.
Which of the following structures in the GI tract is most at risk in this patient as a consequent of the circulatory shock.
(A) submucosal glands
(B) brunner’s glands
(C) tips of the villi
(D) Sphincter muscles
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| mikky
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c... guess work.... as they need lots of energy 4 absorption...
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| silver
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(C) tips of the villi ??
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| sfk
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C. need more energy, farthest from supply
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| Jackofknives
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The arterioles and venules in the microvasculature of the villus are arranged in a parallel fashion, allowing oxygen to diffuse from the arterial side to the venous side. Under normal conditions, as much as 80% of the oxygen may diffuse in this manner and not reach the tip of the villus structure. Under normal conditions, this shunting of oxygen is not harmful, but when blood flow to the gut is curtailed, the oxygen deficit at the tip of the villus can reach a point where the cells begin to die from ischemia.
Concept tested: oxygen shunt
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