What type of cell is a leukocyte?

A leukocyte is a type of white blood cell that plays a crucial role in the immune system. These cells are essential for defending the body against infections, foreign invaders, and diseases. They are part of the body's natural defense mechanism and are involved in various functions such as identifying and destroying pathogens and facilitating immune responses.

The term "leukocyte" is derived from Greek, where "leuko" means white, and "cyte" means cell. This nomenclature reflects their appearance when observed under a microscope, as leukocytes are generally colorless and are distinguished from red blood cells, which contain hemoglobin and are responsible for transporting oxygen. Understanding the function and importance of leukocytes can help in studying various medical conditions related to the immune system, including allergies, autoimmune diseases, and infections.