Introduction to the Immune System: Cells and Tissues

This topic provides a foundational introduction to the immune system, covering its cells, tissues, and historical perspective, essential for tertiary-level biomedical education in Zambia. Students will learn about the three lines of defense: anatomical barriers, innate immune cells (phagocytes, NK cells, granulocytes), and adaptive immune cells (B and T lymphocytes). The functions of primary lymphoid organs (bone marrow, thymus) and secondary lymphoid organs (spleen, lymph nodes, MALT) are explored. This knowledge is vital for Zambian university and college students pursuing diplomas or degrees in medical laboratory science, public health, or immunology. A solid understanding of immune system organization supports exam success, enhances diagnostic reasoning, and prepares learners for roles in healthcare, research, and disease prevention across Zambia, contributing to improved public health outcomes and tertiary education excellence.