Which hormone is secreted by the pancreas and plays a crucial role in lowering blood glucose levels?

💡 Solution & Explanation

Insulin is a vital peptide hormone synthesized and secreted by the beta cells of the islets of Langerhans within the pancreas to facilitate cellular glucose uptake, thereby lowering blood sugar levels. Conversely, glucagon raises blood glucose levels, while thyroxine regulates basal metabolic rate and adrenaline prepares the body for stress. A deficiency or resistance to insulin leads to the metabolic disorder known as diabetes mellitus.