White blood cells are also called leukocytes, and they are part of the body's immune system. They are produced in the bone marrow and circulate in the bloodstream and lymphatic system. There are several types of white blood cells, each with its own specific function.
Some of the main types of white blood cells and their functions include:
* Neutrophils: These are the most common type of white blood cell. They are phagocytic, which means they engulf and destroy foreign particles, such as bacteria and viruses.
* Lymphocytes: There are several types of lymphocytes, including B cells, T cells, and natural killer (NK) cells. B cells produce antibodies, which are proteins that help to destroy foreign invaders. T cells kill infected cells and regulate the immune response. NK cells kill infected cells and tumor cells.
* Monocytes: These are large phagocytic cells that are found in the blood and tissues. They engulf and destroy foreign particles, such as bacteria and viruses.
* Eosinophils: These cells are involved in the body's response to allergies and parasitic infections. They release chemicals that can damage foreign invaders.
* Basophils: These cells are involved in the body's inflammatory response. They release histamine and other chemicals that can cause blood vessels to dilate and fluid to leak out of the vessels.
White blood cells are essential for the body's ability to fight off infections and diseases. They work together to identify and destroy foreign invaders and to regulate the immune response. When the white blood cell count is low, the body is more susceptible to infections.
