What component of blood is involved in the immune response?

White blood cells are a crucial component of the immune response. They play a significant role in identifying, attacking, and destroying pathogens such as bacteria, viruses, and other foreign invaders. There are various types of white blood cells, including lymphocytes (T cells and B cells), which are essential for adaptive immunity. They help the body to remember and recognize previous invaders, leading to a stronger and faster response upon subsequent exposures.

In contrast, red blood cells primarily function in the transportation of oxygen and carbon dioxide, while platelets are involved in blood clotting and preventing blood loss. Plasma, the liquid component of blood, contains water, salts, and proteins, but it doesn't directly participate in the immune response like white blood cells do. Thus, the focus on white blood cells highlights their fundamental role and specialty in defending the body against infections and maintaining immune health.