1. The document discusses the immune system and its main components like lymphocytes, lymph nodes, spleen, thymus gland, and tonsils.
2. It describes the functions of B cells and T cells. B cells produce antibodies while T cells kill infected cells and regulate the immune response.
3. Vaccines help strengthen the immune system by exposing it to weakened or killed forms of viruses or bacteria. The immune system then produces antibodies to fight against future infections from these pathogens.
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ระบบน้ำเหลืองกับภูมิคุ้มกัน(Hant out)
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