He has firmly resolved never to accept a blood transfusion, but his physician urges him to accept one major component, maybe packed red cells. Or the therapy may consist of one small fraction extracted from a component.
उदाहरणार्थ, एका जखमी व्यक्‍तीला प्लास्मा तर दुसऱ्‍या एखाद्या रुग्णाला रक्‍तातल्या तांबड्या पेशी.