How many types of WBC are present in the blood?

The correct answer is that there are five main types of white blood cells (WBCs) present in the blood. These five types are crucial as they play essential roles in the body's immune response, helping to defend against infections and diseases. The five types of WBCs include neutrophils, lymphocytes, monocytes, eosinophils, and basophils. Each type has a specific function:

• Neutrophils are primarily responsible for attacking bacteria and fungi.

• Lymphocytes are involved in the adaptive immune response; they include T cells and B cells, which are important for immune system memory and antibody production.

• Monocytes can differentiate into macrophages and dendritic cells to help in phagocytosis and antigen presentation.

• Eosinophils are involved in combating parasitic infections and contribute to allergic reactions.

• Basophils release histamine during allergic responses and asthma.

Having this understanding of the various white blood cell types allows for a better comprehension of how the immune system operates and how different cells respond to pathogens and other challenges to health.