Final answer:
The pancreas produces insulin and glucagon, hormones that regulate blood glucose levels, with alpha cells releasing glucagon and beta cells releasing insulin.
Step-by-step explanation:
The gland that produces insulin and glucagon is the pancreas. The pancreas contains specialized clusters of endocrine cells known as the islets of Langerhans. Within these islets, alpha cells produce glucagon and beta cells produce insulin. These hormones work in tandem to regulate the body's blood glucose levels. Insulin facilitates the uptake of glucose by the body's cells when blood glucose levels rise, while glucagon stimulates the release of stored glucose from the liver when blood glucose levels fall.