A-LevelBiologyImmunityOct/Nov 2024Paper 2 Q59 Marks
T-lymphocytes are produced in bone marrow and mature in the thymus gland. When mature, T-lymphocytes leave the thymus gland to travel throughout the body. They remain inactive inside organs, such as the spleen and lymph nodes, until activated by the presence of antigens. Fig. 5.1 shows what happens to two inactive T-lymphocytes, U1 and V1, in the presence of an antigen from a virus. [Figure 5.1]
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