What are the main types of white blood cells and their functions?

White blood cells (WBCs) are immune cells that protect the body against infection. Main types include:

• Monocyte: Large cells that differentiate into macrophages.
• Lymphocyte: B cells and T cells, key for adaptive immunity.
• Basophil: Releases histamine during allergic responses.
• Eosinophil: Fights parasites and involved in allergic reactions.

• Neutrophil: Phagocytic cells that respond rapidly to infection.