Blood

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blood transfusion = an injection of a volume of blood, previously taken from a healthy person, into a patient

needy recipients = the people who need blood

erythrocytes [ɪˈrɪθrə(ʊ)sʌɪts] = red blood cells

compatible = well suited

universal donor = a person of blood group O, who can in theory donate blood to recipients of any ABO blood group

plasma = the colourless fluid part of blood, lymph, or milk, in which corpuscles(=cells, antibodies) or fat globules(=drops of fat) are suspended

platelet = a small colourless disc-shaped cell fragment without a nucleus, found in large numbers in blood and involved in clotting

EFL subset that concentrates more on language in context than on grammar and language structures. It covers topics from accounting or computer science to tourism and business management. "Specific" means the studying through a field that is already known and relevant to a student.