circulatory system - leukocytes

neutrophil

• innate immunity

• granulocyte

• first responders

eosinophil

• innate immunity

• granulocyte

• kill parasitic worms; deactivate histamine

basophil

• innate immunity

• granulocyte

• release heparin to prevent blood clots

macrophage

• innate immunity

• monocyte

• phagocytize pathogens, dead cells, and other debris

• “garbage collectors”

dendritic cell

• innate AND adaptive immunity

• monocyte

• presents antigens to lymphocytes

B cells

• adaptive immunity

• lymphocyte

• produce antibodies and forms memory cells

T cells (antigen presentation)

• adaptive immunity

• lymphocyte

• releases cytotoxins, forms memory cells for a faster response to future infections

NK cells (natural killer)

• innate immunity

• lymphocyte

• release enzymes and toxins to kill cancer and viral cells

• no antigen presentation

neutrophils prevalence

60-70%

lymphocyte prevalence

20-30%

macrophage/dendritic cell prevalence

1-6%

eosinophils prevalence

1-3%

basophils prevalence

1%