The immune system — common mistakes

Examiners look for precise terminology. When discussing lymphocytes, clearly differentiate between B-lymphocytes (which differentiate into plasma cells to produce antibodies) and T-lymphocytes (which have cell-mediated roles like cytotoxic T-cells killing infected cells or T-helper cells activating other immune cells). Don't mix them up! Also, ensure you can define terms like 'clonal selection' and 'opsonisation' accurately and in context.

Non-specific immunity (innate) provides an immediate, general defence against any pathogen, using physical barriers, chemicals, and phagocytes. Specific immunity (adaptive) is a targeted, slower response that remembers specific pathogens for future encounters, involving lymphocytes and antibodies. Master these concepts with our premium course materials and practice past papers.

B-lymphocytes are responsible for humoral immunity, maturing into plasma cells that produce antibodies to neutralise pathogens in body fluids. T-lymphocytes are involved in cell-mediated immunity, with cytotoxic T-cells directly killing infected cells and helper T-cells coordinating other immune responses. Dive deeper into their distinct roles with our revision lessons!

Vaccinations induce artificial active immunity by exposing the body to antigens, leading to the formation of memory cells without causing disease. This provides long-term protection and contributes to herd immunity, where a high vaccination rate protects unvaccinated individuals by reducing pathogen transmission. Enhance your understanding with our comprehensive past paper analysis and free course content.