What is the primary mechanism for iron absorption in the duodenum?
ASimple diffusion
BPassive paracellular transport
CEndocytosis
DDMT1 transporter
A 35-year-old woman presents with exertional dyspnea and fatigue for the past 3 weeks. She says there has been an acute worsening of her dyspnea in the past 5 days. On physical examination, the mucous membranes show pallor. Cardiac exam is significant for the presence of a mid-systolic murmur loudest in the 2nd left intercostal space. A CBC and peripheral blood smear show evidence of microcytic, hypochromic anemia. Which of the following parts of the GI tract is responsible for the absorption of the nutrient whose deficiency is most likely responsible for this patient’s condition?
ADuodenum
BJejunum
CTerminal ileum
DBody of the stomach
EAntrum of the stomach
A 25-year-old man presents to the physician with 2 days of profuse, watery diarrhea. He denies seeing blood or mucus in the stools. On further questioning, he reveals that he eats a well-balanced diet and generally prepares his meals at home. He remembers having some shellfish from a street vendor 3 days ago. He takes no medications. His past medical history is unremarkable. Which of the following mechanisms most likely accounts for this patient’s illness?
ATyrosine kinase phosphorylation
BADP-ribosylation of Gs protein
CTyrosine kinase dephosphorylation
DOsmotic effect of intestinal contents
EInflammation of the gastrointestinal wall
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