Full Immuenology

Non specific responses

Skin acts as a barrier

Phagocytosis

Phagocyte attracted to pathogen by chemotaxis

The phagocyte uses receptors on its cell surface membrane

Lysosomes move towards the phagosome formed by the engulfing of the pathogen

Lysosomes release lysozymes which hydrolyse the bacterium

The products of this hydrolysis are absorbed by the phagocyte

Cell mediated immunity

Phagocyte presents anitigens on its cell surface

Receptors on T cell are specific to these

This attachement causes T cells to divide rapidly by

The cloned T cells then become

Memory cells

Stimulate phagocytes to encourage more phagocytosis

Stimulate B cells

Activate Cytotoxic T cells

Humoral

B cells circulate and process and present antigens on their surface

Activated T cells attache to the processed antigen and therefore activate the B cell

B cell divides by mitosis

Into plasma cells which secrete the specific antibody to the antigen which groups pathogens together to aid phagocytosis

Or they develop into memory cells

These can respond rapidly to the same pathogen by dividing rapidly into plasma cells that produce antibodies (secondary immune response)