West-MEC Medical Assisting Technical Skills Assessment (TSA) Practice Exam 2026 - Free Medical Assisting Practice Questions and Study Guide

Insulin is produced by the pancreas, specifically by beta cells in the islets of Langerhans. When blood glucose rises, these cells release insulin, which helps cells—especially in muscle and fat tissue—take in glucose. It also signals the liver to store glucose as glycogen, which lowers blood sugar levels. The liver plays a key role in glucose storage and metabolism, but it does not produce insulin. The pituitary and adrenal glands regulate other hormones and stress responses, not insulin production. So the pancreas is the gland that produces insulin to regulate blood sugar.