In human physiology, which endocrine gland is responsible for secreting the hormone insulin, which plays a central role in lowering blood glucose levels by facilitating cellular uptake?

💡 Solution & Explanation

The pancreas contains specialized clusters of cells known as the islets of Langerhans, where beta cells secrete insulin to promote glucose storage as glycogen in the liver and skeletal muscles. Thyroid gland secretes thyroxine which regulates basal metabolic rate. Adrenal glands produce cortisol and adrenaline for stress response. Pituitary gland acts as the master endocrine gland controlling multiple other hormonal axes. Insulin deficiency or cellular resistance leads to diabetes mellitus.