A-level Biology Notes

describe the specific response?

-phagocytes perform phagocytosis (engulf and destroy pathogen) without destroying the antigen, they place antigens on their surface, they present antigens

-T lymphocytes (T cells) bind to the antigen and become stimulated

-They divide by mitosis to form three types of cells: T helper, t killer and t memory

-T helper cells stimulate B lymphocytes (B cells)

-T killer cells kill infected cells (infected by virus)

-T memory cells provide long term immunity

-B lymphocytes (B cells) engulf and present antigens on their surface the T helper cells bind to this

-The B cells become stimulated and divide by mitosis to make two types of cells: plasma cells and the B memory cells

-Plasma cells make antibodies

-B memory cells provide long term immunity