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Melena: Quiz


Question 1: The black color is caused by oxidation of the iron in ________ during its passage through the ileum and colon.
Arterial blood gasHemoglobinSerum ironGlycated hemoglobin

Question 2: In medicine, melena or melaena refers to the black, "tarry" ________ that are associated with gastrointestinal hemorrhage.
ToiletCoprophagiaFecesHuman feces

Question 3: For this reason, melena is often associated with ________ in the stomach or duodenum (upper gastrointestinal tract), for example by a peptic ulcer.
Blood plasmaPlateletRed blood cellBlood

Question 4: Although blood swallowed as a result of a nose bleed (________) can lead to melena, it is obviously not due to bleeding in the gastro-intestinal tract.
EpistaxisMedical signICD-10 Chapter XVIII: Symptoms, signs and abnormal clinical and laboratory findingsSymptom

Question 5: Some causes of "false" melena include Iron supplements, Pepto-Bismol, Maalox, and ________.

Question 6: Only blood that originates from a high source (such as the ________), or bleeding from a lower source that occurs slowly enough to allow for oxidation, is associated with melena.
StomachColon (anatomy)Small intestineVermiform appendix

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