Security coverage apply to certain. types of work. If you are self-employed, you earn. Social Security credits the same way. employees do (one credit for each $1,260. in net earnings, but no more than four. credits per year). Special rules apply if. you have net annual earnings of less. than $400.
White blood cells (WBCs), 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 leukocytes are produced and derived from a multipotent cell in the bone marrow known as a hematopoietic stem cell.onocytes and neutrophils are phagocytic. The number of leukocytes in the blood is often an indicator of disease, and thus the WBC count is an important subset of the complete blood count. The normal white cell count is usually between 4 and 11 Ã 10 9 /L.
Many enzymes are produced by the body to carry out a variety of biochemical reactions. One such enzyme is esterase, which are of different types. One type of esterase is known as âleukocyte esteraseâ. White blood cells secrets this enzyme. Sponsored link. White blood cells protect the body but if leukocyte esterase is found in urine it means there is infection in urinary tract. Kidneys, bladder, ureters and urethra form the urinary system and when analysis of urine shows leukocytes (without nitrates) in urine it indicates infection in the system.