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Review Question - QID 213575

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QID 213575 (Type "213575" in App Search)
A 1-day-old infant is evaluated for recurrent emesis and difficulty feeding since birth. He was born at term to a healthy G1P1 mother but vomited a greenish-yellow fluid right after birth. Since then, he has continued to vomit despite not feeding. Physical exam reveals abdominal distention but is otherwise unremarkable with no palpable masses. A radiograph is obtained and the results are shown in Figure A. Which of the following mechanisms is associated with this patient's disorder?
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