Question

The immune system helps to protect you against viruses and bacteria that can cause sickness. Which cells are part of the immune system?

• A. White blood cells
• B. Red blood cells
• C. Nerve cells
• D. None of the above

Answer 1

The correct option is A White blood cells

White blood cells (WBCs), also called leukocytes, are an important part of the immune system. These cells help fight infections by attacking bacteria, viruses, and germs that invade the body. White blood cells originate in the bone marrow but circulate throughout the bloodstream. There are five major types of white blood cells:

• Neutrophils
• Lymphocytes
• Eosinophils
• Monocytes
• Basophils

Hence the correct option is A.