A 40-Year-Old Man Is Participating in a Clinical Study on Glucose

Multiple Choice

A 40-year-old man is participating in a clinical study on glucose clearance from the blood. He receives 25 grams of oral glucose; 1 hour later, the glucose load is completely cleared from the blood. He then receives 25 grams of intravenous glucose; 1 hour later, the glucose load is not cleared completely from the blood. This difference in glucose clearance following oral and intravenous administration can be attributed to the actions of which of the following hormones?

A) Cholecystokinin
B) Gastrin
C) Glucose-dependent insulinotropic peptide
D) Motilin
E) Secretin