Which organ is responsible for the secretion of insulin?

The pancreas is the organ responsible for the secretion of insulin. It plays a crucial role in the regulation of blood glucose levels. The pancreas contains specialized cells called beta cells, located in the islets of Langerhans, which produce and secrete insulin in response to elevated blood sugar levels.

Insulin is a key hormone that facilitates the uptake of glucose by tissues, particularly muscle and fat, and helps maintain homeostasis in blood glucose levels. The process of insulin secretion is stimulated by factors such as the presence of glucose in the bloodstream after eating.

In contrast, the liver primarily functions in glucose storage and release but does not secrete insulin. The adrenal glands secrete hormones such as cortisol and adrenaline, while the thyroid primarily produces hormones that regulate metabolism, but neither of these organs has a role in insulin production. Therefore, the pancreas is uniquely responsible for this vital endocrine function.