What is the most numerous leukocyte?

The most numerous leukocyte is the neutrophil. Neutrophils are a type of white blood cell that are part of the body's immune system. They are the most common type of leukocyte, making up 50-70% of all white blood cells. Neutrophils are produced in the bone marrow and circulate in the blood for about 10 days before they are destroyed. They are then replaced by new neutrophils that are produced in the bone marrow.

Neutrophils are important for fighting infection. They are attracted to sites of infection by chemicals that are released by bacteria and other microorganisms. Once they reach the site of infection, neutrophils engulf and destroy the microorganisms. Neutrophils also release chemicals that help to kill bacteria and other microorganisms.

Neutrophils are also involved in the inflammatory response. They release chemicals that cause blood vessels to dilate and become more permeable, allowing fluid and other cells to leak into the tissue. This helps to bring more immune cells to the site of infection and helps to clear away dead cells and debris.