biology - topic 2 - specific response

humoral immunity

specific antigen taken into b cell by endocytosis and presented on surface

helper t cells attach to antigen and activate b cells

b cells divide by mitosis to form a clone which then differentiate into plasma cells that produce antibodies

they then differentiate into memory cells that are responsible for the secondary immune response

cell mediated immunity

receptors on helper t cell are complementary to the antigen

helper t cell divides by mitosis to form genetically identical clones

these stimulate b cells, phagocytes, cytotoxic t cells (damage CSM of bacteria/virus/infected cell) or become memory cells that are responsible for the secondary immune response

t lymphocytes

carry out cell mediated immunity

mature in thymus gland

b lymphocytes

carry out humoral immunity

mature in bone marrow

specific immune response

response is specific to individual antigens

slower but can provide long term immunity