Insulin is secreted by:

Insulin is a crucial hormone secreted by the Pancreas. Specifically, it is produced by the beta cells within the islets of Langerhans in the pancreas. Insulin plays a vital role in regulating blood glucose levels by facilitating the uptake of glucose into cells for energy or storage.

• The Adrenal gland produces hormones like adrenaline and cortisol, involved in stress response.
• The Pituitary gland is the 'master gland' that regulates many other endocrine glands but does not produce insulin.
• The Thyroid gland produces hormones that regulate metabolism and growth.

Dysfunction in insulin production or action leads to diabetes.