DefinitionKinins are proteins in the blood that affect certain muscle contractions and blood pressure (especially low blood pressure).They also:Increase blood flow throughout the bodyMake it easier for fluids to pass through small blood vessels (capillaries)Stimulate pain receptorsAre part of a complex system that helps repair damaged tissue in the bodyReferencesFirestein GS. Mechanisms of inflammation and tissue repair. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 45.