reakcije

Reakcije is a plural term used in several South Slavic languages to denote reactions or responses. It can describe processes in science, such as chemical or biological changes, as well as how individuals, groups, or systems respond to events, stimuli, or statements. The noun ultimately derives from the Latin reactio, through French réaction.

In chemistry, a reaction is a process that transforms reactants into products, often accompanied by energy changes. Common types include synthesis, decomposition, single- and double-displacement, and combustion. Reaction rates depend on temperature, concentration, surface area, and the presence of catalysts. Chemical equilibria describe the balance between forward and reverse reactions.

In biology and physiology, reactions include enzymatic processes, reflexes, and immune responses. Cells sense signals and trigger cascades that alter metabolism or gene expression. Hormonal and nervous system signaling coordinate systemic responses to maintain homeostasis.

In psychology and everyday language, reactions refer to emotional or cognitive responses to events, statements, or social cues. Public or media reactions describe how audiences or markets respond to news, performances, or products.

In medicine, reactions often refer to adverse effects to drugs, vaccines, or allergens—hypersensitivity reactions or drug reactions that require monitoring and, if necessary, treatment.