The nucleus of a cell coordinates processes and
activities that take place in the cell. which two
systems perform a similar function in the human
body?
(1) nervous and endocrine
(2) digestive and reproductive
(3) circulatory and respiratory
(4) skeletal and muscular

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.