Question

The main function of white blood cells is

• A. To help red blood cells in the transportation of oxygen and carbon dioxide.
• B. To clot the blood at the time of injuries.
• C. To accelerate the production of red blood cells in the bone marrow.
• D. To defend the body against infections.

Answer 1

The correct option is D To defend the body against infections.

White blood cells(WBCs) are the body's defense systems. They attack foreign bodies that invaded the blood or any part of the body. Foreign bodies like the bacteria, viruses and the fungi rendering them less invasive and even destroys them. They are cells involved in the “inflammatory” response. This response develops when tissue is damaged or invaded by microbes. Neutrophils specialize is killing bacteria. Eosinophils kill parasites. Monocytes control inflammation by releasing cytokines. Lymphocytes recognize and destroy cells infected by viruses or transplanted foreign cells.

So, the correct option is 'To defend the body against infections'