Which Organ is Part of More Than One Organ System

Question

Which organ is part of more than one organ system?  
A) Stomach
B) Liver
C) Pancreas
D) Intestine
E) Brain

Accepted Answer

The pancreas is part of both the digestive system, where it produces digestive enzymes, and the endocrine system, where it secretes insulin and glucagon to regulate blood sugar levels.