White Blood CellsBacteria exist everywhere in the environment and have continuous access to the body through the mouth, nose and skin pores. Furthermore, many cells age and die every day and their remains must be removed, here white blood cells play their role. According to this quote, without white blood cells, also known as leukocytes, we could not survive. White blood cells are our body's number one defense against infections. They help keep us clean of foreign bacteria that enter our body. Statistics show that there are five to ten thousand white blood cells per microliter of blood, but this number increases during an illness. White blood cells can differ in many ways, such as size, shape, and coloring characteristics. There are five different types of white blood cells that fall into two separate categories. One category is called granular leukocytes and the other is called agranular white blood cells. There are three different types of granular leukocytes. The neutrophil is a phagocyte, produced in the bone marrow that ingests and destroys bacteria extremely quickly. The neutrophil has a diameter of approximately ten to twelve micrometres. They make up approximately 60-70% of the total number of white blood cells in our body. Eosinphil is a type of white blood cell that secretes poisonous materials to kill parasites, allergies and phagocytosis of bacteria, which occurs when the...