IMMUNOLOGY

Detailed explanation-1: -White blood cells, also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders. All white blood cells are produced and derived from multipotent cells in the bone marrow known as hematopoietic stem cells.

Detailed explanation-2: -The white blood cells are called leukocytes (from the Greek “leukos” meaning “white” and “kytos, ‘’ meaning “cell”). The granular leukocytes (eosinophils, neutrophils, and basophils) are named for the granules in their cytoplasm; the agranular leukocytes (monocytes and lymphocytes) lack cytoplasmic granules.