The human body tightly controls blood glucose concentrations to prevent dangerous metabolic imbalances, utilizing specialized hormones secreted by endocrine glands like the pancreas. Insulin, produced by pancreatic beta cells, dominates the fed state by lowering blood sugar through enhanced cellular glucose uptake, glycogen synthesis, and fat storage. Conversely, glucagon is synthesized by alpha cells to prevent hypoglycemia during fasting by promoting glycogen breakdown and glucose production in the liver. Additional chemical messengers, such as epinephrine, cortisol, and growth hormone, act as counter-regulatory factors that elevate blood sugar levels in response to stress and low energy availability. Together, these interconnected hormonal pathways maintain overall metabolic homeostasis across various vital tissues and organs.
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