Which two hormones most directly control blood glucose?

Insulin lowers blood glucose by promoting uptake and storage and suppressing hepatic output, while glucagon raises it by driving glycogen breakdown and gluconeogenesis; their balance maintains the glucose set point.

Where does the body store glucose?

Glucose is stored mainly as glycogen in the liver and skeletal muscle, with the liver releasing glucose to the circulation during fasting and muscle using its stores locally.

Glucose Metabolism and Regulation

Glucose metabolism and regulation describe how the body produces, stores, releases, and uses glucose, and how hormones keep circulating glucose within a narrow range across feeding and fasting. The system balances glucose supply against demand so that the brain and other tissues receive a steady fuel without the harms of sustained high or low blood glucose.

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Definition

Glucose metabolism and regulation is the integrated set of biochemical and hormonal processes — chiefly the opposing actions of insulin and glucagon on the liver, muscle, and adipose tissue — that maintain blood glucose within a narrow physiological range.

Scope

This topic covers the normal physiology of glucose handling: insulin- and glucagon-driven control, hepatic glucose production and storage, peripheral glucose uptake, and the counter-regulatory response to fasting and stress. It is the physiological baseline against which the diabetes topics in this area are understood, and it is treated as reference physiology rather than clinical guidance.

Core questions

How is blood glucose kept stable between meals and during fasting?
What are the roles of insulin and glucagon in glucose control?
How do the liver, muscle, and fat each contribute to glucose handling?
How does the body defend against hypoglycaemia?

Key concepts

Insulin secretion and action
Glucagon and counter-regulation
Glycogenolysis and gluconeogenesis
Glycogenesis (glucose storage)
Peripheral glucose uptake
Glucose set point and negative feedback

Mechanisms

When blood glucose rises after eating, pancreatic beta cells secrete insulin, which signals through the insulin receptor to increase glucose uptake by muscle and adipose tissue, promote hepatic and muscle glycogen synthesis, and suppress hepatic glucose output, while also coordinating lipid metabolism. As glucose falls during fasting, insulin secretion declines and counter-regulatory hormones — led by glucagon — drive glycogen breakdown and gluconeogenesis in the liver to restore supply. This reciprocal, feedback-controlled balance holds plasma glucose within a tight range and is the system whose failure defines diabetes.

Clinical relevance

A working grasp of normal glucose regulation is the basis for interpreting abnormal glucose states and for understanding how each form of diabetes deviates from physiology. This entry explains the regulatory framework conceptually and does not provide individual diagnostic thresholds or treatment recommendations.

Evidence & guidelines

Diagnostic categories for disordered glucose metabolism — including impaired fasting glucose and impaired glucose tolerance as intermediate states — are defined in professional consensus documents such as the American Diabetes Association Standards of Care, which anchor the abnormal end of the regulatory spectrum.

Seminal works

saltiel-kahn-2001
guyton-hall-2020

Frequently asked questions

Which two hormones most directly control blood glucose?: Insulin lowers blood glucose by promoting uptake and storage and suppressing hepatic output, while glucagon raises it by driving glycogen breakdown and gluconeogenesis; their balance maintains the glucose set point.
Where does the body store glucose?: Glucose is stored mainly as glycogen in the liver and skeletal muscle, with the liver releasing glucose to the circulation during fasting and muscle using its stores locally.