What is the role of white blood cells?

What is the role of white blood cells?

• A. They play an important role in immune defense against infections
• B. They transport oxygen in the blood
• C. They clot blood
• D. They store fat

Answer: (A)

White blood cells are the body's defenders against infections. They circulate in the bloodstream and tissues, recognizing invading pathogens and mounting immune responses. Some cells, like neutrophils and macrophages, actively destroy microbes, while others, such as lymphocytes, coordinate targeted defenses and produce antibodies. This immune defense role is what white blood cells do best. In contrast, transporting oxygen is the job of red blood cells, clotting is mainly handled by platelets and coagulation factors, and fat storage occurs in adipose tissue.

White blood cells are the body's defenders against infections. They circulate in the bloodstream and tissues, recognizing invading pathogens and mounting immune responses. Some cells, like neutrophils and macrophages, actively destroy microbes, while others, such as lymphocytes, coordinate targeted defenses and produce antibodies. This immune defense role is what white blood cells do best. In contrast, transporting oxygen is the job of red blood cells, clotting is mainly handled by platelets and coagulation factors, and fat storage occurs in adipose tissue.