HAP lymphatic and immunity

neutrophils

• Most abundant; First line of defense after bacteria have entered tissues.

• Phagocytosis of bacteria

basophils

Recruited to sites of allergic reactions.

• Capable of producing histamine

eosinophils

Recruited to sites of allergic reactions.

• Killing of parasitic worm

monocytes

Enter tissues, where they differentiate into macrophages.

• Macrophages have two main functions:

• Phagocytosis

• Antigen presentation (macrophages can be antigen presenting cells

Antigen presentation – what is it?

Ans: Certain cells, like macrophages,

can recognise, ingest and digest

pathogens. These digested products

can be moved to the surface of

macrophages and be presented as

foreign antigens. Antigen presentation

helps to trigger other forms of immune responses