Question

How are white blood cells created?

Answer 1

The body fluid of humans is divided into intracellular body fluid or extracellular body fluid. WBC is a part of blood and comes under blood corpuscles. It is also known as leukocytes and it is the most active and mobile part of blood as well as lymph.

Complete answer:
White blood cells created inside the bone marrow as soft fatty tissue in bone cavities in hematopoietic stem cells. Vitamin C also helps to produce more white blood cells which help to fight body infections.
The white blood cell of the human body is divided into mainly granulocyte and agranulocyte, and it further gets divided into Neutrophil, eosinophils, lymphocyte, monocyte and basophils. The neutrophil is the most abundant part of white blood cells and it is phagocytic which destroys foreign organisms. Eosinophils are $2-3\%$ and resist infections and dissolve blood clots. It also destroys parasites by the liberation of lysosomes. Lymphocytes are $20-25 \%$ and they produce serum globulins to destroy the microbes and their toxins, it also helps to kill tumour cells. Monocyte is the largest white blood cell and it is present only at $6-8\%$, it is phagocytic and engulf bacteria and cellular debris. Basophils are $0.5- 1\%$ and they secrete histamine, serotonin and heparin.

Note:
In the human body leukocyte is lesser in number and it is calculated as total leucocyte count which varies from 6000 to 8000 per cubic metre. An increase in leucocyte leads to bacterial infection or in severe cases it can form cancer whereas a fall in white blood cells leads to the weakening of the immune system.