What is the primary function of white blood cells (WBCs)?

The primary function of white blood cells (WBCs), also known as leukocytes, is to fight infections. They are a crucial component of the immune system, which protects the body against pathogens such as bacteria, viruses, and other foreign invaders. WBCs have various roles in the immune response, including identifying and neutralizing harmful microorganisms, producing antibodies, and orchestrating the activity of other immune cells.

WBCs can be classified into different types, each specialized for specific functions, such as neutrophils that are primarily involved in responding to bacterial infections, lymphocytes which play a key role in the adaptive immune response, and monocytes that help clean up debris and pathogens. Their ability to move freely throughout the bloodstream and into tissues allows them to quickly respond to infections and inflammation, highlighting their central role in maintaining health and fighting disease.