Definition & Facts. Diverticulosis is a condition that occurs when small pouches, or sacs, form and push outward through weak spots in the wall of your colon. In diverticulitis, one or a few of the pouches in the wall of your colon become inflamed. Symptoms & Causes Most people with diverticulosis do not have symptoms. Symptoms may include constipation, diarrhea, abdominal pain, or bloating. Diverticulitis most often causes abdominal pain, which is usually severe. Experts are not sure what causes these conditions.
For the album by the band The White Stripes, see White Blood Cells (album) . 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.
phocytes of the immune system are the only cells in the body to make antibodies, while developing red blood cells are the only cells that make the oxygen-transport protein hemoglobin. The differences between a neuron, a lymphocyte, a liver cell, and a red blood cell depend upon the precise control of gene expression. In each case the cell is using only some of the genes in its total repertoire. In this chapter, we shall discuss the main ways in which gene expression is controlled in bacterial and eucaryotic cells. Although some mecha-nisms of control apply to both sorts of cells, eucaryotic cells, through