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.
adjective. The definition of perky is someone who is cheerful, peppy and self-confident. A smiling, happy cheerleader with lots of energy is an example of someone who might be described as perky.
Image by Flickr.com, courtesy of Marie Tretiakova. Sometimes fabrics are specific to a certain demographic or object. Older people may prefer the feel of silk to something like fleece, which would be used in a blanket or other comfort object. One variation on fleece is minky fabric.ips. Using minky fabric as a sewing material can be challenging, but there are tips that can help. Cut minky with a rotary cutter to cut down on the inevitable mess of fuzz. Although time consuming, pin minky every one to 1.5 inches. Minky has a tendency to curl, so give a seam allowance of about 1/2 inch.