A 40-year-old man is brought to the emergency department

Last updated: 7/31/2022

A 40-year-old man is brought to the emergency department because of lethargy, confusion, and a fainting episode 2 hours ago. He was alert after he regained consciousness. Over the past 2 months he has gained more than 10 kg (22 lb). He takes no medications. The patient's father has a history of recurrent stomach ulcers despite multiple medications. Laboratory studies show a glucose concentration of 45 mg/dL and an increased C-peptide concentration. The hormone that is most likely causing this patient's symptoms is originally synthesized in which of the following structures? A Free ribosomes B Mitochondria C Rough endoplasmic reticulum D Secretory granules E Smooth endoplasmic reticulum