What is White Blood Corpuscles (WBC) or Leucocytes

Its shape is similar to Amoeba.
Its life span is from 2 to 4 days.
Nucleus is present in the White Blood Corpuscles.
Its formation takes place in Bone marrow, lymph node and sometimes in liver and spleen.
Its main function is to protect the body from the disease.
About 60 to 70% part of WBC is made up of neutrophile corpuscles which help in engulfing disease causing microorganism and bacteria.
The ratio of RBC and WBC is 600 :1.