What is the most common type of leukocyte?

Neutrophils are the most common type of leukocyte, typically making up about 55-70% of all white blood cells in the human body. They play a crucial role in the immune response, particularly in the defense against bacterial infections. Their main function is to ingest and destroy pathogens through a process called phagocytosis.

Neutrophils respond quickly to sites of infection or injury and are among the first cells to arrive at the scene of inflammation. They possess unique granules that contain enzymes and antimicrobial substances which are vital for neutralizing bacteria and fungi.

In contrast, other types of leukocytes, such as lymphocytes, basophils, and eosinophils, have more specialized functions. Lymphocytes are essential for adaptive immunity and are increased in viral infections. Eosinophils are primarily responsible for combating parasitic infections and are involved in allergic reactions. Basophils, while crucial in mediating inflammatory responses, are the least common type of leukocyte. This distinction highlights the pivotal role neutrophils have in the body’s immediate immune defense, underscoring why they are categorized as the most prevalent white blood cell type.