Immunity

Phagocytes - nuetrophils and microphages

- originate and mature in bone marrow

- act using phagocytosis:

- cells under attaack release histamines which attract neutrophils

- put in vesicle

- lysosome fuses with vesicle

- releases toxins

- breaks down pathogen

lymphocytes

- Both T and B lymphocytes orginate in bone marrow

- But T lymphocytes mature in thymus and then spread through lymph nodes

Immune response

- when a foreign organism enters body => actiates immune response => foreign antigen is called non-self antigen

- T helper cells secrete cytokines which stimulate B cells

- B cells clone => memory cells produced during primary response

- divide by mitosis in secondary…