GLOSSARY

Coordinated glucose regulation

Islet output integrates nutrients, autonomic inputs, incretin signals and local cell-to-cell communication. Insulin and glucagon act on different tissues through distinct receptor pathways. Secretion, circulating concentration, insulin sensitivity and glucose disposal are related but separate quantities.

Interpreting the mechanism

The phases overlap and depend on the experimental protocol. A reduced early phase and an altered sustained response provide different information about beta-cell function.

During movement and recovery

Contracting muscle can increase glucose uptake while circulating insulin declines. Hepatic glucose output and carbohydrate availability help match demand. People using glucose-lowering medicines may have different exercise responses, so general physiology does not replace individualized clinical planning.