Which component of blood plays a crucial role in the immune response?

Globulins are a type of protein found in the blood plasma and play a significant role in the immune response. They can be divided into several categories, including antibodies or immunoglobulins, which are essential for identifying and neutralizing foreign objects like bacteria and viruses. When the body encounters an antigen, specific B cells are activated to produce antibodies, leading to the formation of an immune response. Globulins are instrumental in the transport of these antibodies, allowing the immune system to adapt and respond effectively to pathogens.

In contrast, while plasma serves as the liquid medium for blood components and contains various proteins, including globulins, it does not directly engage in the immune response itself. Erythrocytes, or red blood cells, are primarily responsible for oxygen transport and do not play a role in immunity. Platelets are involved in blood clotting and wound healing but do not contribute to the immune response. Therefore, globulins are the most relevant in the context of the immune function of blood.