Which organ is responsible for secreting insulin and glucagon?

The pancreas plays a crucial role in regulating blood sugar levels by secreting the hormones insulin and glucagon. Insulin lowers blood sugar levels by facilitating the uptake of glucose by cells, while glucagon has the opposite effect, raising blood sugar levels by prompting the liver to release stored glucose. This balance is essential for maintaining homeostasis in the body.

In comparison, the other organs listed have different functions. The pituitary gland is primarily involved in regulating various endocrine functions and is known as the "master gland," but it does not secrete insulin or glucagon. The liver, while it stores glucose and processes insulin, does not produce these hormones. The gallbladder is involved in the storage of bile for digestion but has no role in hormone secretion. Understanding the specific functions of each organ helps clarify the integral role of the pancreas in glucose regulation.