Answer: E, Neutrophils. About 60% of all white blood cells are neutrophils.
Key Takeaway: All white blood cells comprise the body’s primary defense against foreign agents. When a foreign agent is detected, neutrophils and other white blood cells are recruited by body signals, and serve to destroy the foreign agent through a variety of processes. The lymphocyte is the second most common type of white blood cell, and is also a key constituent of the immune system.
According to the NIH, neutrophils are type of white blood cell that is an important part of the immune system and helps the body fight infection. When microorganisms, such as bacteria or viruses, enter the body, neutrophils are one of the first immune cells to respond. They travel to the site of infection, where they destroy the microorganisms by ingesting them and releasing enzymes that kill them. Neutrophils also boost the response of other immune cells. A neutrophil is a type of granulocyte and a type of phagocyte.
